1000+ Aptitude Odd Man Out Questions and Answers - 4

 Question: 1

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

(A) 100

(B) 112

(C) 128

(D) 166

View Answer

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

(C) 46

(D) 59

View Answer

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

(C) 63

(D) 127

View Answer

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

(C) 64

(D) 10

View Answer

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

(C) 405

(D) 3645

View Answer

Ans: B

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

Question: 6

Find out the wrong number in the series:
7, 8, 18, 57, 228, 1165, 6996

(A) 228

(B) 57

(C) 18

(D) 8

View Answer

Ans: A

Let the given numbers be A, B, C, D, E, F, G.

Then, A, A x 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.

Clearly, 228 is wrong.

Question: 7

Find out the wrong number in the series:
6, 12, 48, 100, 384, 768, 3072

(A) 48

(B) 100

(C) 384

(D) 768

View Answer

Ans: B

Each even term of the series is obtained by multiplying the previous term by 2.

2nd term = (1st term) x 2 = 6 x 2 = 12;

4th term = (3rd term) x 2 = 48 x 2 = 96;

6th term = (5th term) x 2 = 384 x 2 = 768;

Therefore, 4th term should be 96 instead of 100.

Question: 8

Find out the wrong number in the series:
125, 106, 88, 76, 65, 58, 53

(A) 65

(B) 76

(C) 88

(D) 106

View Answer

Ans: C

Go on subtracting prime numbers 19, 17, 13, 11, 7, 5 from the numbers to get the next number.

So, 88 is wrong.

Question: 9

Find out the wrong number in the series:
3, 8, 15, 24, 34, 48, 63

(A) 15

(B) 24

(C) 34

(D) 48

View Answer

Ans: C

The difference between consecutive terms are respectively 5, 7, 9, 11 and 13.

So, 34 is a wrong number.

Question: 10

Find out the wrong number in the series:
1, 1, 2, 6, 24, 96, 720

(A) 6

(B) 24

(C) 96

(D) 720

View Answer

Ans: C

Go on multiplying with 1, 2, 3, 4, 5, 6 to get the next number.

So, 96 is wrong.