1000+ Odd Man Out Series Aptitude Questions and Answers - 1
Question: 1
Find out the wrong number in each sequence:
25, 36, 49, 81, 121, 169, 225
(A) 169
(B) 121
(C) 49
(D) 36
Ans: D
The numbers are squares of odd natural numbers, starting from 5 upto 15. So, 36 is wrong.
Question: 2
Find out the wrong number in each sequence:
4, 6, 8, 9, 10, 11, 12
(A) 9
(B) 10
(C) 11
(D) 12
Ans: C
Each number is a composite number except 11.
Question: 3
Find out the wrong number in each sequence:
56, 72, 90, 110, 132, 150
(A) 150
(B) 132
(C) 110
(D) 72
Ans: A
The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13. So, 150 is wrong.
Question: 4
Find out the wrong number in each sequence:
3, 10, 21, 36, 55, 70, 105
(A) 36
(B) 55
(C) 70
(D) 105
Ans; C
The pattern is 1 x 3, 2 x 5, 3 x 7, 4 x 9, 5 x 11, 6 x 13, 7 x 15 etc.
Question: 5
Find out the wrong number in each sequence:
8, 27, 125, 343, 1331
(A) 125
(B) 343
(C) 1331
(D) None of these
Ans: D
The numbers are cubes of primes i.e., 23, 33, 53, 73, 113. Clearly, none is wrong.
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