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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

In following question,a number series is given with one term missing. Choose the correct alternative

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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