EduGoog
In following number series, two terms have been put within brackets. Choose the appropriate option

9 , 12 , 11 , 14 , 13 , x , 15

Option:
A. 12
B. 16
C. 10
D. 17
Answer: B . 16

Justification:

Alternately we add 3 and subtract 1. Thus,
9 + 3 = 12, 12 - 1 = 11, 11 + 3 = 14
and so on. Missing number = 13 + 3 = 16.

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