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The number of ways a person can contribute to a fund out of 1 ten-rupee note, 1 fiverupee note, 1 two-rupee and 1 one rupee note is
- a)15
- b)25
- c)10
- d)none of these
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The number of ways a person can contribute to a fund out of 1 ten-rupe...
Given: 1 ten-rupee note, 1 five-rupee note, 1 two-rupee note and 1 one-rupee note
To find: Number of ways a person can contribute to a fund using these notes
Solution:
We can approach this problem by listing down all possible combinations of notes that can be used to contribute to the fund.
Ten rupee note:
- We can either use the ten-rupee note or not use it. So, there are 2 possibilities.
Five rupee note:
- We can either use the five-rupee note or not use it. So, there are 2 possibilities.
Two rupee note:
- We can either use the two-rupee note or not use it. So, there are 2 possibilities.
One rupee note:
- We can either use the one-rupee note or not use it. So, there are 2 possibilities.
Total number of possibilities = 2 x 2 x 2 x 2 = 16
However, one of the possibilities is not valid as it does not contribute anything to the fund (i.e. not using any note). So, the actual number of ways to contribute to the fund is 16 - 1 = 15.
Therefore, the correct option is (a) 15.
To find: Number of ways a person can contribute to a fund using these notes
Solution:
We can approach this problem by listing down all possible combinations of notes that can be used to contribute to the fund.
Ten rupee note:
- We can either use the ten-rupee note or not use it. So, there are 2 possibilities.
Five rupee note:
- We can either use the five-rupee note or not use it. So, there are 2 possibilities.
Two rupee note:
- We can either use the two-rupee note or not use it. So, there are 2 possibilities.
One rupee note:
- We can either use the one-rupee note or not use it. So, there are 2 possibilities.
Total number of possibilities = 2 x 2 x 2 x 2 = 16
However, one of the possibilities is not valid as it does not contribute anything to the fund (i.e. not using any note). So, the actual number of ways to contribute to the fund is 16 - 1 = 15.
Therefore, the correct option is (a) 15.
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Community Answer
The number of ways a person can contribute to a fund out of 1 ten-rupe...
Suppose, 10 ruppe note be "A'
suppose five ruppe note be "B'
suppose two ruppe note be "C'
suppose one ruppe note be "D'
thus, a person can contribute, 'ABCD" 'A" "B" "C" "D" "AB" "AC" "AD "BC" "BD" "CD" "ABC" "ABD" "ACD" BCD"
Count them!
: )
suppose five ruppe note be "B'
suppose two ruppe note be "C'
suppose one ruppe note be "D'
thus, a person can contribute, 'ABCD" 'A" "B" "C" "D" "AB" "AC" "AD "BC" "BD" "CD" "ABC" "ABD" "ACD" BCD"
Count them!
: )
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The number of ways a person can contribute to a fund out of 1 ten-rupee note, 1 fiverupee note, 1 two-rupee and 1 one rupee note isa)15b)25c)10d)none of theseCorrect answer is option 'A'. Can you explain this answer?
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