Find out the incorrect number 11, 5, 20, 12, 40, 26, 74, 54 - Number Series - Series Completion -

In following questions, one term in number series is incorrect. - Find out the incorrect number 11, 5, 20, 12, 40, 26, 74, 54

A. 5

B. 20

C. 40

D. 26

E. None of the above

Answer: C. 40

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.

Posted in: Number Series - Series Completion - Verbal Reasoning