100+ Wrong Number Series Questions and Answers - 1

Question: 1

In each of the following questions, one term in the number series is wrong. Find out the wrong term.
1, 2, 4, 8, 16, 32, 64, 96

(A) 4

(B) 32

(D) 99

View Answer

Ans: C

Each term of the series is obtained by multiplying the preceding term by 2.
So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.

Question: 2

In each of the following questions, one term in the number series is wrong. Find out the wrong term.
8, 27, 125, 343, 1331

(A) 8

(B) 343

(D) none of these

View Answer

Ans: D

The numbers are cubes of prime numbers i.e. 2³, 3³, 5³, 7³, 11³. Clearly, none is wrong.

Question: 3

In each of the following questions, one term in the number series is wrong. Find out the wrong term.
3, 4, 10, 32, 136, 685, 4116

(A) 4116

(B) 685

(D) 10

View Answer

Ans: C

The sequence is as follows:
2nd term = (1st term + 1) x 1
3rd term = (2nd term + 1) x 2
4th term = (3rd term + 1) x 3 and so on.
So, 32 is wrong and must be replaced by (10 x 1) x 3 i.e. 33.

Question: 4

In each of the following questions, one term in the number series is wrong. Find out the wrong term.
3, 5, 7, 9, 11, 13

(A) 9

(B) 7

(D) 3

View Answer

Ans: A

The series consists of consecutive prime numbers. So, 9 is wrong.

Question: 5

In each of the following questions, one term in the number series is wrong. Find out the wrong term.
56, 72, 90, 110, 132, 150

(A) 150

(B) 110

(D) 72

View Answer

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 and must be replaced by (12 x 13) i.e. 156.

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100+ Wrong Number Series Questions and Answers - 1

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