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

(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

(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

(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

(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

(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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