1000+ Aptitude Odd Man Out Questions and Answers - 1

Question: 1

Find out the wrong number in the series:
190, 166, 145, 128, 112, 100, 91

(A) 100

(B) 112

(D) 166

Ans: C

Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.

Clearly, 128 is wrong.

Question: 2

Find out the wrong number in the series:
19, 26, 33, 46, 59, 74, 91

(A) 26

(B) 33

(D) 59

Ans: B

Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number.

So, 33 is wrong.

Question: 3

Find out the wrong number in the series:
3, 7, 15, 27, 63, 127, 255

(A) 7

(B) 27

(D) 127

Ans: B

Go on multiplying the number by 2 and adding 1 to it to get the next number. So, 27 is wrong.

Question: 4

Find out the wrong number in the series:
1, 3, 10, 21, 64, 129, 356, 777

(A) 356

(B) 129

(D) 10

Ans: A

A x 2 + x, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.

So, 356 is wrong.

Question: 5

Find out the wrong number in the series:
5, 15, 30, 135, 405, 1215, 3645

(A) 15

(B) 30

(D) 3645

Ans: B

Multiply each term by 3 to obtain the next term. Hence, 30 is a wrong number.

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