Practice Questions: Classification- 3 | Logical Reasoning for CLAT PDF Download

Directions: In this type of questions, certain numbers are given, out of which all except one share some common property and hence are alike, while one is different and this number is to be chosen as the answer.

Q1: Choose the number which is DIFFERENT from the rest?
(a) 2345
(b) 3456
(c) 5467
(d) 5678
Ans: (c)
All other numbers contain four consecutive digits in order.
Hence, option C is correct.

Q2: Choose the number which is DIFFERENT from the rest?
(a) 21
(b) 69
(c) 81
(d) 83
Ans: (d)
Each of the numbers except 83 is divisible by 3.
Hence, option D is correct.

Q3: Choose the number which is DIFFERENT from the rest?
(a) 361
(b) 434
(c) 566
(d) 529
Ans: (c)
Each of the numbers except 566 is a perfect square.
Hence, option C is correct.

Q4: Choose the number which is DIFFERENT from the rest?
(a) 25631
(b) 33442
(c) 34424
(d) 52163
Ans: (b)
In all other numbers, the sum of the digits is 17.
Hence, option B is correct.

Q5: Choose the number which is DIFFERENT from the rest?
(a) 392
(b) 326
(c) 414
(d) 248
Ans: (a)
Except the first, all others are the product of the digits, which is a perfect square.
2nd option: 326 ⇒ 3 × 2 × 6 = 36 = 6² 
3rd option: 414 ⇒ 4 × 1 × 4 = 16 = 4² 
4th option: 248 ⇒ 2 × 4 × 8 = 64 = 8²
But
1st option: 392 ⇒ 3 × 9 × 2 = 54.
Hence, the first option is different.
Hence, option A is correct.

Q6: Choose the number which is DIFFERENT from the rest?
(a) 28
(b) 65
(c) 126
(d) 126
Ans: (a)
28 is the only number with all digits even.
Hence, option A is correct.

Q7: Choose the number which is DIFFERENT from the rest?
(a) 2468
(b) 2648
(c) 4826
(d) 6482
Ans: (a)
All other numbers contain the first four consecutive even numbers but not in proper order.
Hence, option A is correct.

Q8: Choose the number which is DIFFERENT from the rest?
(a) 369
(b) 462
(c) 761
(d) 862
Ans: (c)
761 is the only prime number in the group.
Hence, option C is correct.

Q9: Choose the number which is DIFFERENT from the rest?
(a) 9611
(b) 7324
(c) 2690
(d) 1754
Ans: (b)
From the options, we get:
1st option: 9611 ⇒ 9 + 6 + 1 + 1 = 17
3rd option: 2690 ⇒ 2 + 6 + 9 + 0 = 17
4th option: 1754 ⇒ 1 + 7 + 5 + 4 = 17
But 2nd option: 7324 ⇒ 7 + 3 + 2 + 4 = 16.
Hence, the second option is different.
Hence, option B is correct.

Q10: Choose the number which is DIFFERENT from the rest?
(a) 5788
(b) 5878
(c) 6482
(d) 9748
Ans: (c)
From the options, we get:
1st option: 5788 ⇒ 5 + 7 + 8 + 8 = 28
2nd option: 5878 ⇒ 5 + 8 + 7 + 8 = 28
4th option: 9748 ⇒ 9 + 7 + 4 + 8 = 28
But 3rd option: 6482 ⇒ 6 + 4 + 8 + 2 = 20.
Hence, the third option is different.
Hence, option C is correct.

Directions: In this type of questions, certain pairs/groups of numbers are given out of which all except one are similar in some manner while one is different. The numbers in these similar pairs/groups may have the same property or may be related to each other according to the same rule. The candidate is required to choose the odd pair/group.

Q1: Which Pair does NOT belong with the others?
(a) 7 – 84
(b) 6 – 108
(c) 5 – 75
(d) 3 – 99
Ans: (a)
In all other pairs, the second number is obtained by multiplying the square of the first number by a prime number. Thus, 108 = 62 × 3, 75 = 52 × 3, 99 = 32 × 11.
Hence, option A is correct.

Q2: Which Pair does NOT belong with the others?
(a) 48 : 134
(b) 40 : 110
(c) 18 : 48
(d) 30 : 80
Ans: (c)
In all other pairs, 2nd number = (1st number × 3) – 10.
Hence, option C is correct.

Q3: Which Pair does NOT belong with the others?
(a) 3, 4
(b) 4, 7
(c) 5, 12
(d) 20, 21
Ans: (d)
In all other pairs, one of the two numbers is prime.
Hence, option D is correct.

Q4: Which Pair does NOT belong with the others?
(a) 62 – 37
(b) 74 – 40
(c) 74 – 40
(d) 103 – 78
Ans: (b)
In all other pairs, the difference between the two numbers is 25.
Hence, option B is correct.

Q5: Which Pair does NOT belong with the others?
(a) 11, 115
(b) 10, 90
(c) 9, 72
(d) 8, 56
Ans: (a)
In all other pairs, the sum of the two numbers is a perfect square.
Hence, option A is correct.

Q6: Which Pair does NOT belong with the others?
(a) 24 – 21
(b) 46 – 32
(c) 62 – 23
(d) 84 – 24
Ans: (c)
In all other pairs, the first number is obtained by multiplying the second number by 2 and then reversing the digits of the number so obtained.
Hence, option C is correct.

Q7: Which Pair does NOT belong with the others?
(a) 34 – 12
(b) 43 – 30
(c) 52 – 21
(d) 62 – 19
Ans: (d)
In all other pairs, the sum of the digits in the difference of the two numbers is 4.
Hence, option D is correct.

Q8: Which Pair does NOT belong with the others?
(a) 43 : 6
(b) 28 : 4
(c) 50 : 7
(c) 36 : 5
Ans: (b)
In all other pairs, 2nd number = 2nd number.
Hence, option B is correct.

Q9: Which Pair does NOT belong with the others?
(a) 7 : 18
(b) 9 : 26
(c) 11 : 36
(c) 13 : 42
Ans: (c)
In all other pairs, 2nd number = (1st number × 4) – 10.
Hence, option C is correct.

Q10: Which Pair does NOT belong with the others?
(a) 81, 63
(b) 24, 48
(c) 21, 15
(c) 13, 39
Ans: (a)
This is the only group in which the sum of the digits of both the numbers is the same.
Hence, option A is correct.