Question Details

1, 2, 5, 16, 68, 326

Find the wrong number in the given series.

Options

A

16

B

326

C

5

D

68

E

2

Show Answer

Correct Answer :

Option D

68

Solution :

The correct option is 68.

To find the wrong number in the given series, let us analyze the pattern between consecutive terms:

First term: 1

Second term: 1×1+1=2

Third term: 2×2+1=5

Fourth term: 5×3+1=16

Following this pattern, the fifth term should be:
16×4+1=64+1=65

Let us verify this with the sixth term:
65×5+1=325+1=326

This matches the last term of the given series. Therefore, the fifth term should be 65 instead of 68.

Thus, 68 is the wrong number in the series.

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