Wrong Number Series Quiz Questions for Bank Exams Pdf - 1

Question: 1

In each of the following questions, one term in the number series is wrong. Find out the wrong term.
1, 3, 7, 15, 27, 63, 127

(A) 7

(B) 15

(C) 27

(D) 63

Ans: C

The sequence is +2, +4, +8 ..... i.e. +2, +22, +23, ....
So, 27 is wrong and must be replaced by (15 + 24) i.e. (15 + 16) or 31.

Question: 2

1, 5, 9, 16, 25, 37, 49

(A) 37

(B) 25

(C) 15

(D) 9

Ans: C

The given sequence is a combination of two series:
I. 1, 9, 25, 49 and
II. 5, 15, 37
The pattern in I is +8, +16, +24.
So, 16 is wrong and must be replaced by (42 + 1) i.e. 17.

Question: 3

16, 22, 30, 45, 52, 66

(A) 30

(B) 45

(C) 52

(D) 68

Ans: B

The correct sequence is +6, +8, +10, + 12, + 14.
So, 45 is wrong and must be replaced by (30 + 10) i.e. 40.

Question: 4

15, 16, 22, 29, 45, 70

(A) 70

(B) 45

(C) 22

(D) 16

Ans: C

The pattern is +1, +4, +9, +16, +25, .. i.e. +12, + 22, + 32, + 42, + 52, ...
So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.

Question: 5

8, 13, 21, 32, 47, 63, 83

(A) 47

(B) 32

(C) 21

(D) 13

Ans: A

The sequence is +5, +8, +11, ....
47 is wrong and must be replaced by (32 + 14) i.e. 46.

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