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In following questions, one term in number series is incorrect.

Find out the incorrect number 11, 5, 20, 12, 40, 26, 74, 54

Option:
A. 5
B. 20
C. 40
D. 26
Answer: C . 40

Justification:

The given sequence is a combination of two series :
I.   11, 20, 40, 74   and
II.   5, 12, 26, 54
The pattern in I becomes + 9, + 18, + 36, ... if 40 is replaced by 38.
So, 40 is wrong.

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