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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 that will same pattern and fill in the blank spaces.

1, 2, 3, 6, 9, 18, , 54

Option:
A. 18
B. 27
C. 36
D. 81
Answer: B . 27

Justification:

The numbers are alternately multiplied by 2 and 3 / 2.
Thus, 1 * 2 = 2,
2 * 3 / 2 = 3,
3 * 2 = 6,
6 * 3 / 2 = 9 and so on.
.'. Missing number = 18 * 3 / 2 = 27.
 

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