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

4 , 9 , 5 , 12 , 7 , 15 , 8 , x , 10.

Option:
A. 25
B. 18
C. 21
D. 24
Answer: B . 18

Justification:

The given sequence is a combination of two series :
4 , 5 , 7 , 8 , 10 and  9 , 12 , 15 , (...).
the missing term is 18.

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