Practice Questions: Classification- 6 | Logical Reasoning for CLAT PDF Download

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 : 26
(b) 8 : 30
(c) 10 : 35
(d) 13 : 44
Ans: (b)
In all other pairs, 2nd number = (1st number × 3) + 5.
Hence, option B is correct.

Q2: Choose the number which is different from the rest?
(a) 8 – 27
(b) 125 – 216
(c) 343 – 512
(d) 1009 – 1331
Ans: (d)
All other pairs contain cubes of two successive natural numbers e.g., 8 = 2³ and 27 = 3³.
Hence, option D is correct.

Q3: Which Pair does NOT belong with the others?
(a) (18, 45)
(b) (23, 14)
(c) (29, 82)
(d) (36, 27)
Ans: (c)
In all other pairs, the difference between the two numbers is a multiple of 9.
Hence, option C is correct.

Q4: Which Pair does NOT belong with the others?
(a) 18 : 108
(b) 23 : 138
(c) 20 : 80
(d) 26 : 156
Ans: (c)
In all other pairs, the second number is 6 times the first.
Hence, option C is correct.

Q5: Which Pair does NOT belong with the others?
(a) 15 : 46
(b) 12 : 37
(c) 9 : 28
(d) 8 : 33
Ans: (d)
In all other pairs, 2nd number = (1st number × 3) + 1.
Hence, option D is correct.

Q6: Which Pair does NOT belong with the others?
(a) 15 : 63
(b) 22 : 91
(c) 23 : 95
(d) 31 : 97
Ans: (d)
In all other pairs, 2nd number = (1st number × 4) + 3.
Hence, option D is correct.

Q7: Which Pair does NOT belong with the others?
(a) 21 – 49
(b) 24 – 64
(c) 25 – 54
(d) 81 – 36
Ans: (c)
This is the only pair in which the two numbers have no common factor.
Hence, option C is correct.

Q8: Which Pair does NOT belong with the others?
(a) 3, 5
(b) 6, 2
(c) 1, 7
(d) 7, 3
Ans: (d)
In all other pairs, the sum of the two numbers is 8.
Hence, option D is correct.

Q9: Which Pair does NOT belong with the others?
(a) 16 – 18
(b) 56 – 63
(c) 96 – 108
(d) 86 – 99
Ans: (d)
In all other pairs, the ratio of the two numbers is 8 : 9.
Hence, option D is correct.

Q10: Which Pair does NOT belong with the others?
(a) (52, 142)
(b) (54, 126)
(c) (56, 168)
(d) (58, 184)
Ans: (c)
In all other pairs, the sum of the digits of both the numbers is the same.
Hence, option C is correct.