4 , 9 , 5 , 12 , 7 , 15 , 8 , x , 10. - Number Series - Series Completion - Verbal Reasoning questio

A. 25

B. 18

C. 21

D. 24

E. None of the above

Answer: B. 18

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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