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1. The probability that it will rain tomorrow is 0.85. What is the probability that it 
will not rain tomorrow? 
Solution: 
Let event of raining tomorrow be P (A) 
The probability of raining tomorrow is P (A) = 0.85 
Probability of not raining is given by P (A) = 1 – P (A) 
? Probability of not raining = P (A) = 1 – 0.85  
                                                          = 0.15 
 
2. A die thrown. Find the probability of getting: 
(i) a prime number 
(ii) 2 or 4 
(iii) a multiple of 2 or 3 
Solution: 
(i) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Prime numbers are: 1, 3 and 5 
Total number of prime numbers = 3 
Probability of getting a prime number = Total prime numbers/Total number of outcomes 
                                                             = 3/6 
                                                             = 1/2 
 ? Probability of getting a prime number = 1/2  
 
(ii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Probability of getting 2 and 4 is Total numbers/Total number of outcomes 
                                                = 2/6 
                                                = 1/3 
 ? Probability of getting 2 and 4 is 1/3 
 
(iii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Multiples of 2 and 3 are = 2, 3, 4 and 6 
Total number of multiples are 4 
Probability of getting a multiple of 2 or 3 is Total numbers/Total number of outcomes 
                                                                   = 4/6 
                                                                   = 2/3 
 ? Probability of getting a multiple of 2 or 3 is 2/3 
Page 2


 
 
 
 
  
 
 
                                                     
 
1. The probability that it will rain tomorrow is 0.85. What is the probability that it 
will not rain tomorrow? 
Solution: 
Let event of raining tomorrow be P (A) 
The probability of raining tomorrow is P (A) = 0.85 
Probability of not raining is given by P (A) = 1 – P (A) 
? Probability of not raining = P (A) = 1 – 0.85  
                                                          = 0.15 
 
2. A die thrown. Find the probability of getting: 
(i) a prime number 
(ii) 2 or 4 
(iii) a multiple of 2 or 3 
Solution: 
(i) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Prime numbers are: 1, 3 and 5 
Total number of prime numbers = 3 
Probability of getting a prime number = Total prime numbers/Total number of outcomes 
                                                             = 3/6 
                                                             = 1/2 
 ? Probability of getting a prime number = 1/2  
 
(ii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Probability of getting 2 and 4 is Total numbers/Total number of outcomes 
                                                = 2/6 
                                                = 1/3 
 ? Probability of getting 2 and 4 is 1/3 
 
(iii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Multiples of 2 and 3 are = 2, 3, 4 and 6 
Total number of multiples are 4 
Probability of getting a multiple of 2 or 3 is Total numbers/Total number of outcomes 
                                                                   = 4/6 
                                                                   = 2/3 
 ? Probability of getting a multiple of 2 or 3 is 2/3 
 
 
 
 
  
 
 
 
3. In a simultaneous throw of a pair of dice, find the probability of getting: 
(i) 8 as the sum 
(ii) a doublet 
(iii) a doublet of prime numbers 
(iv) a doublet of odd numbers 
(v) a sum greater than 9 
(vi) An even number on first 
(vii) an even number on one and a multiple of 3 on the other 
(viii) neither 9 nor 11 as the sum of the numbers on the faces 
(ix) a sum less than 6 
(x) a sum less than 7 
(xi) a sum more than 7 
(xii) at least once 
(xiii) a number other than 5 on any dice. 
Solution: 
Let us construct a table. 
Here the first number denotes the outcome of first die and second number denotes the 
outcome of second die. 
 
 
(i) 8 as the sum  
Total number of outcomes in the above table are 36 
Number of outcomes having 8 as sum are: (6, 2), (5, 3), (4, 4), (3, 5) and (2, 6) 
Therefore numbers of outcomes having 8 as sum are 5 
Probability of getting numbers of outcomes having 8 as sum is = Total numbers/Total 
number of outcomes 
                                                                                                     = 5/36 
? Probability of getting numbers of outcomes having 8 as sum is 5/36  
 
Page 3


 
 
 
 
  
 
 
                                                     
 
1. The probability that it will rain tomorrow is 0.85. What is the probability that it 
will not rain tomorrow? 
Solution: 
Let event of raining tomorrow be P (A) 
The probability of raining tomorrow is P (A) = 0.85 
Probability of not raining is given by P (A) = 1 – P (A) 
? Probability of not raining = P (A) = 1 – 0.85  
                                                          = 0.15 
 
2. A die thrown. Find the probability of getting: 
(i) a prime number 
(ii) 2 or 4 
(iii) a multiple of 2 or 3 
Solution: 
(i) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Prime numbers are: 1, 3 and 5 
Total number of prime numbers = 3 
Probability of getting a prime number = Total prime numbers/Total number of outcomes 
                                                             = 3/6 
                                                             = 1/2 
 ? Probability of getting a prime number = 1/2  
 
(ii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Probability of getting 2 and 4 is Total numbers/Total number of outcomes 
                                                = 2/6 
                                                = 1/3 
 ? Probability of getting 2 and 4 is 1/3 
 
(iii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Multiples of 2 and 3 are = 2, 3, 4 and 6 
Total number of multiples are 4 
Probability of getting a multiple of 2 or 3 is Total numbers/Total number of outcomes 
                                                                   = 4/6 
                                                                   = 2/3 
 ? Probability of getting a multiple of 2 or 3 is 2/3 
 
 
 
 
  
 
 
 
3. In a simultaneous throw of a pair of dice, find the probability of getting: 
(i) 8 as the sum 
(ii) a doublet 
(iii) a doublet of prime numbers 
(iv) a doublet of odd numbers 
(v) a sum greater than 9 
(vi) An even number on first 
(vii) an even number on one and a multiple of 3 on the other 
(viii) neither 9 nor 11 as the sum of the numbers on the faces 
(ix) a sum less than 6 
(x) a sum less than 7 
(xi) a sum more than 7 
(xii) at least once 
(xiii) a number other than 5 on any dice. 
Solution: 
Let us construct a table. 
Here the first number denotes the outcome of first die and second number denotes the 
outcome of second die. 
 
 
(i) 8 as the sum  
Total number of outcomes in the above table are 36 
Number of outcomes having 8 as sum are: (6, 2), (5, 3), (4, 4), (3, 5) and (2, 6) 
Therefore numbers of outcomes having 8 as sum are 5 
Probability of getting numbers of outcomes having 8 as sum is = Total numbers/Total 
number of outcomes 
                                                                                                     = 5/36 
? Probability of getting numbers of outcomes having 8 as sum is 5/36  
 
 
 
 
 
  
 
 
(ii) a doublet 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet are: (1, 1), (2, 2), (3, 3), (4, 4), (5, 5) and (6, 6) 
Number of outcomes as doublet are 6 
Probability of getting numbers of outcomes as doublet is = Total numbers/Total number 
of outcomes 
                                                                                           = 6/36 
                                                                                           = 1/6 
? Probability of getting numbers of outcomes as doublet is 1/6  
 
(iii) a doublet of prime numbers 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet of prime numbers are: (1, 1), (3, 3), (5, 5) 
Number of outcomes as doublet of prime numbers are 3 
Probability of getting numbers of outcomes as doublet of prime numbers is = Total 
numbers/Total number of outcomes 
                                                                                                                         = 3/36 
                                                                                                                         = 1/12 
? Probability of getting numbers of outcomes as doublet of prime numbers is 1/12  
 
(iv) a doublet of odd numbers 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet of odd numbers are: (1, 1), (3, 3), (5, 5) 
Number of outcomes as doublet of odd numbers are 3 
Probability of getting numbers of outcomes as doublet of odd numbers is = Total 
numbers/Total number of outcomes 
                                                                                                                      = 3/36 
                                                                                                                      = 1/12 
? Probability of getting numbers of outcomes as doublet of odd numbers is 1/12  
 
(v) a sum greater than 9 
Total number of outcomes in the above table are 36 
Number of outcomes having sum greater than 9 are: (4, 6), (5, 5), (5, 6), (6, 6), (6, 4), (6, 
5) 
Number of outcomes having sum greater than 9 are 6 
Probability of getting numbers of outcomes having sum greater than 9 is = Total 
numbers/Total number of outcomes 
                                                                                                                     = 6/36 = 1/6 
? Probability of getting numbers of outcomes having sum greater than 9 is 1/6 
Page 4


 
 
 
 
  
 
 
                                                     
 
1. The probability that it will rain tomorrow is 0.85. What is the probability that it 
will not rain tomorrow? 
Solution: 
Let event of raining tomorrow be P (A) 
The probability of raining tomorrow is P (A) = 0.85 
Probability of not raining is given by P (A) = 1 – P (A) 
? Probability of not raining = P (A) = 1 – 0.85  
                                                          = 0.15 
 
2. A die thrown. Find the probability of getting: 
(i) a prime number 
(ii) 2 or 4 
(iii) a multiple of 2 or 3 
Solution: 
(i) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Prime numbers are: 1, 3 and 5 
Total number of prime numbers = 3 
Probability of getting a prime number = Total prime numbers/Total number of outcomes 
                                                             = 3/6 
                                                             = 1/2 
 ? Probability of getting a prime number = 1/2  
 
(ii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Probability of getting 2 and 4 is Total numbers/Total number of outcomes 
                                                = 2/6 
                                                = 1/3 
 ? Probability of getting 2 and 4 is 1/3 
 
(iii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Multiples of 2 and 3 are = 2, 3, 4 and 6 
Total number of multiples are 4 
Probability of getting a multiple of 2 or 3 is Total numbers/Total number of outcomes 
                                                                   = 4/6 
                                                                   = 2/3 
 ? Probability of getting a multiple of 2 or 3 is 2/3 
 
 
 
 
  
 
 
 
3. In a simultaneous throw of a pair of dice, find the probability of getting: 
(i) 8 as the sum 
(ii) a doublet 
(iii) a doublet of prime numbers 
(iv) a doublet of odd numbers 
(v) a sum greater than 9 
(vi) An even number on first 
(vii) an even number on one and a multiple of 3 on the other 
(viii) neither 9 nor 11 as the sum of the numbers on the faces 
(ix) a sum less than 6 
(x) a sum less than 7 
(xi) a sum more than 7 
(xii) at least once 
(xiii) a number other than 5 on any dice. 
Solution: 
Let us construct a table. 
Here the first number denotes the outcome of first die and second number denotes the 
outcome of second die. 
 
 
(i) 8 as the sum  
Total number of outcomes in the above table are 36 
Number of outcomes having 8 as sum are: (6, 2), (5, 3), (4, 4), (3, 5) and (2, 6) 
Therefore numbers of outcomes having 8 as sum are 5 
Probability of getting numbers of outcomes having 8 as sum is = Total numbers/Total 
number of outcomes 
                                                                                                     = 5/36 
? Probability of getting numbers of outcomes having 8 as sum is 5/36  
 
 
 
 
 
  
 
 
(ii) a doublet 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet are: (1, 1), (2, 2), (3, 3), (4, 4), (5, 5) and (6, 6) 
Number of outcomes as doublet are 6 
Probability of getting numbers of outcomes as doublet is = Total numbers/Total number 
of outcomes 
                                                                                           = 6/36 
                                                                                           = 1/6 
? Probability of getting numbers of outcomes as doublet is 1/6  
 
(iii) a doublet of prime numbers 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet of prime numbers are: (1, 1), (3, 3), (5, 5) 
Number of outcomes as doublet of prime numbers are 3 
Probability of getting numbers of outcomes as doublet of prime numbers is = Total 
numbers/Total number of outcomes 
                                                                                                                         = 3/36 
                                                                                                                         = 1/12 
? Probability of getting numbers of outcomes as doublet of prime numbers is 1/12  
 
(iv) a doublet of odd numbers 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet of odd numbers are: (1, 1), (3, 3), (5, 5) 
Number of outcomes as doublet of odd numbers are 3 
Probability of getting numbers of outcomes as doublet of odd numbers is = Total 
numbers/Total number of outcomes 
                                                                                                                      = 3/36 
                                                                                                                      = 1/12 
? Probability of getting numbers of outcomes as doublet of odd numbers is 1/12  
 
(v) a sum greater than 9 
Total number of outcomes in the above table are 36 
Number of outcomes having sum greater than 9 are: (4, 6), (5, 5), (5, 6), (6, 6), (6, 4), (6, 
5) 
Number of outcomes having sum greater than 9 are 6 
Probability of getting numbers of outcomes having sum greater than 9 is = Total 
numbers/Total number of outcomes 
                                                                                                                     = 6/36 = 1/6 
? Probability of getting numbers of outcomes having sum greater than 9 is 1/6 
 
 
 
 
  
 
 
 
(vi) An even number on first 
Total number of outcomes in the above table are 36 
Number of outcomes having an even number on first are: (2, 1), (2, 2), (2, 3), (2, 4), (2, 
5), (2, 6), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6), (6, 1), (6, 2), (6, 3), (6, 4), (6, 5) and (6, 
6) 
Number of outcomes having an even number on first are 18 
Probability of getting numbers of outcomes having an even number on first is = Total 
numbers/Total number of outcomes  
                                                                                                                            = 18/36 
                                                                                                                            = 1/2 
? Probability of getting numbers of outcomes having an even number on first is 1/2  
 
(vii) An even number on one and a multiple of 3 on the other 
Total number of outcomes in the above table are 36 
Number of outcomes having an even number on one and a multiple of 3 on the other are: 
(2, 3), (2, 6), (4, 3), (4, 6), (6, 3) and (6, 6) 
Number of outcomes having an even number on one and a multiple of 3 on the other are 
6 
Probability of getting an even number on one and a multiple of 3 on the other is = Total 
numbers/Total number of outcomes 
                                                                                                                             = 6/36 
                                                                                                                             = 1/6 
? Probability of getting an even number on one and a multiple of 3 on the other is 1/6 
 
(viii) Neither 9 nor 11 as the sum of the numbers on the faces 
Total number of outcomes in the above table are 36 
Number of outcomes having 9 nor 11 as the sum of the numbers on the faces are: (3, 6), 
(4, 5), (5, 4), (5, 6), (6, 3) and (6, 5) 
Number of outcomes having neither 9 nor 11 as the sum of the numbers on the faces are 6 
Probability of getting 9 nor 11 as the sum of the numbers on the faces is = Total 
numbers/Total number of outcomes 
                                                                                                                   = 6/36 
                                                                                                                   = 1/6 
Probability of outcomes having 9 nor 11 as the sum of the numbers on the faces P (E) = 
1/6 
?Probability of getting neither 9 nor 11 as the sum of the numbers on the faces is 1/6  
 
Probability of outcomes not having 9 nor 11 as the sum of the numbers on the faces is 
Page 5


 
 
 
 
  
 
 
                                                     
 
1. The probability that it will rain tomorrow is 0.85. What is the probability that it 
will not rain tomorrow? 
Solution: 
Let event of raining tomorrow be P (A) 
The probability of raining tomorrow is P (A) = 0.85 
Probability of not raining is given by P (A) = 1 – P (A) 
? Probability of not raining = P (A) = 1 – 0.85  
                                                          = 0.15 
 
2. A die thrown. Find the probability of getting: 
(i) a prime number 
(ii) 2 or 4 
(iii) a multiple of 2 or 3 
Solution: 
(i) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Prime numbers are: 1, 3 and 5 
Total number of prime numbers = 3 
Probability of getting a prime number = Total prime numbers/Total number of outcomes 
                                                             = 3/6 
                                                             = 1/2 
 ? Probability of getting a prime number = 1/2  
 
(ii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Total number of outcome = 6 
Probability of getting 2 and 4 is Total numbers/Total number of outcomes 
                                                = 2/6 
                                                = 1/3 
 ? Probability of getting 2 and 4 is 1/3 
 
(iii) Outcomes of a die are: 1, 2, 3, 4, 5, 5 and 6 
Multiples of 2 and 3 are = 2, 3, 4 and 6 
Total number of multiples are 4 
Probability of getting a multiple of 2 or 3 is Total numbers/Total number of outcomes 
                                                                   = 4/6 
                                                                   = 2/3 
 ? Probability of getting a multiple of 2 or 3 is 2/3 
 
 
 
 
  
 
 
 
3. In a simultaneous throw of a pair of dice, find the probability of getting: 
(i) 8 as the sum 
(ii) a doublet 
(iii) a doublet of prime numbers 
(iv) a doublet of odd numbers 
(v) a sum greater than 9 
(vi) An even number on first 
(vii) an even number on one and a multiple of 3 on the other 
(viii) neither 9 nor 11 as the sum of the numbers on the faces 
(ix) a sum less than 6 
(x) a sum less than 7 
(xi) a sum more than 7 
(xii) at least once 
(xiii) a number other than 5 on any dice. 
Solution: 
Let us construct a table. 
Here the first number denotes the outcome of first die and second number denotes the 
outcome of second die. 
 
 
(i) 8 as the sum  
Total number of outcomes in the above table are 36 
Number of outcomes having 8 as sum are: (6, 2), (5, 3), (4, 4), (3, 5) and (2, 6) 
Therefore numbers of outcomes having 8 as sum are 5 
Probability of getting numbers of outcomes having 8 as sum is = Total numbers/Total 
number of outcomes 
                                                                                                     = 5/36 
? Probability of getting numbers of outcomes having 8 as sum is 5/36  
 
 
 
 
 
  
 
 
(ii) a doublet 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet are: (1, 1), (2, 2), (3, 3), (4, 4), (5, 5) and (6, 6) 
Number of outcomes as doublet are 6 
Probability of getting numbers of outcomes as doublet is = Total numbers/Total number 
of outcomes 
                                                                                           = 6/36 
                                                                                           = 1/6 
? Probability of getting numbers of outcomes as doublet is 1/6  
 
(iii) a doublet of prime numbers 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet of prime numbers are: (1, 1), (3, 3), (5, 5) 
Number of outcomes as doublet of prime numbers are 3 
Probability of getting numbers of outcomes as doublet of prime numbers is = Total 
numbers/Total number of outcomes 
                                                                                                                         = 3/36 
                                                                                                                         = 1/12 
? Probability of getting numbers of outcomes as doublet of prime numbers is 1/12  
 
(iv) a doublet of odd numbers 
Total number of outcomes in the above table are 36 
Number of outcomes as doublet of odd numbers are: (1, 1), (3, 3), (5, 5) 
Number of outcomes as doublet of odd numbers are 3 
Probability of getting numbers of outcomes as doublet of odd numbers is = Total 
numbers/Total number of outcomes 
                                                                                                                      = 3/36 
                                                                                                                      = 1/12 
? Probability of getting numbers of outcomes as doublet of odd numbers is 1/12  
 
(v) a sum greater than 9 
Total number of outcomes in the above table are 36 
Number of outcomes having sum greater than 9 are: (4, 6), (5, 5), (5, 6), (6, 6), (6, 4), (6, 
5) 
Number of outcomes having sum greater than 9 are 6 
Probability of getting numbers of outcomes having sum greater than 9 is = Total 
numbers/Total number of outcomes 
                                                                                                                     = 6/36 = 1/6 
? Probability of getting numbers of outcomes having sum greater than 9 is 1/6 
 
 
 
 
  
 
 
 
(vi) An even number on first 
Total number of outcomes in the above table are 36 
Number of outcomes having an even number on first are: (2, 1), (2, 2), (2, 3), (2, 4), (2, 
5), (2, 6), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6), (6, 1), (6, 2), (6, 3), (6, 4), (6, 5) and (6, 
6) 
Number of outcomes having an even number on first are 18 
Probability of getting numbers of outcomes having an even number on first is = Total 
numbers/Total number of outcomes  
                                                                                                                            = 18/36 
                                                                                                                            = 1/2 
? Probability of getting numbers of outcomes having an even number on first is 1/2  
 
(vii) An even number on one and a multiple of 3 on the other 
Total number of outcomes in the above table are 36 
Number of outcomes having an even number on one and a multiple of 3 on the other are: 
(2, 3), (2, 6), (4, 3), (4, 6), (6, 3) and (6, 6) 
Number of outcomes having an even number on one and a multiple of 3 on the other are 
6 
Probability of getting an even number on one and a multiple of 3 on the other is = Total 
numbers/Total number of outcomes 
                                                                                                                             = 6/36 
                                                                                                                             = 1/6 
? Probability of getting an even number on one and a multiple of 3 on the other is 1/6 
 
(viii) Neither 9 nor 11 as the sum of the numbers on the faces 
Total number of outcomes in the above table are 36 
Number of outcomes having 9 nor 11 as the sum of the numbers on the faces are: (3, 6), 
(4, 5), (5, 4), (5, 6), (6, 3) and (6, 5) 
Number of outcomes having neither 9 nor 11 as the sum of the numbers on the faces are 6 
Probability of getting 9 nor 11 as the sum of the numbers on the faces is = Total 
numbers/Total number of outcomes 
                                                                                                                   = 6/36 
                                                                                                                   = 1/6 
Probability of outcomes having 9 nor 11 as the sum of the numbers on the faces P (E) = 
1/6 
?Probability of getting neither 9 nor 11 as the sum of the numbers on the faces is 1/6  
 
Probability of outcomes not having 9 nor 11 as the sum of the numbers on the faces is 
 
 
 
 
  
 
 
given by P (E) = 1 – 1/6 = (6-1)/5 = 5/6  
? Probability of outcomes not having 9 nor 11 as the sum of the numbers on the faces is 
5/6  
 
(ix) A sum less than 6 
Total number of outcomes in the above table are 36 
Number of outcomes having a sum less than 6 are: (1, 1), (1, 2), (1, 3), (1, 4), (2, 1), (2, 
2), (2, 3), (3, 1), (3, 2), (4, 1) 
Number of outcomes having a sum less than 6 are 10 
Probability of getting a sum less than 6 is = Total numbers/Total number of outcomes 
                                                                   = 10/36 
                                                                   = 5/18 
? Probability of getting sum less than 6 is 5/18  
 
(x) A sum less than 7 
Total number of outcomes in the above table are 36 
Number of outcomes having a sum less than 7 are: (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (2, 
1), (2, 2), (2, 3), (2, 4), (3, 1), (3, 2), (3, 3), (4, 1), (4, 2), (5, 1) 
Number of outcomes having a sum less than 7 are 15 
Probability of getting a sum less than 7 is = Total numbers/Total number of outcomes 
                                                                   = 15/36 
                                                                   = 5/12 
? Probability of getting sum less than 7 is 5/12  
 
(xi) A sum more than 7 
Total number of outcomes in the above table are 36 
Number of outcomes having a sum more than 7 are: (2, 6), (3, 5), (3, 6), (4, 4), (4, 5), (4, 
6), (5, 3), (5, 4), (5, 5), (5, 6), (6, 2), (6, 3), (6, 4), (6, 5), (6, 6) 
Number of outcomes having a sum more than 7 are 15 
Probability of getting a sum more than 7 is = Total numbers/Total number of outcomes 
                                                                     = 15/36 
                                                                     = 5/12 
? Probability of getting sum more than 7 is 5/12  
 
(xii) At least once 
Total number of outcomes in the above table 1 are 36 
Number of outcomes for at least once are 11 
Probability of getting outcomes for at least once is = Total numbers/Total number of 
outcomes 
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