# Aptitude Odd Man Out Questions Answers for Competitive Exams - 1

Question: 1

Find out the wrong number in a given series.

644, 328, 164, 84, 44, 24, 14

(A) 44

(B) 84

(C) 164

(D) 328

Ans: D

644 – 320 = 324

324 – 160 = 164

164 – 80 = 84

84 – 40 = 44

44 – 20 = 24

24 – 10 = 14

Hence 328 is wrong number, correct number is 328.

Question: 2

Find out the wrong number in a given series.

445, 221, 109, 46, 25, 11, 4

(A) 11

(B) 25

(C) 46

(D) 109

Ans: C

Go on subtracting 3 and dividing the result by 2 to obtain the next number.

Clearly, 46 is wrong.

Question: 3

Find out the wrong number in a given series.

36, 64, 81, 125, 169

(A) 169

(B) 125

(C) 81

(D) 64

Ans: B

The sequence is 6^{2}, 8^{2}, 9^{2}, 11^{2}, 13^{2}.

All numbers except 125 are perfect squares.

Therefore 125 is wrong.

Question: 4

Find out the wrong number in a given series.

124, 133, 142, 152, 160

(A) 133

(B) 142

(C) 152

(D) 160

Ans: C

The sequence is an A.P. with common difference 9.

Therefore 142 + 9 = 151.

Therefore 152 is wrong.

Question: 5

Find out the wrong number in a given series.

6, 13, 18, 25, 30, 37, 40

(A) 25

(B) 30

(C) 37

(D) 40

Ans: D

The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.

So 40 is wrong.

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