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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 correct alternative

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

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

Justification:

The numbers are alternatively multiplied by 2 and 3/2.
So, 1 X 2 = 2,
2 X 3/2 = 3,
3 X 2 = 6,
6 X 3/2 = 9,
so missing number = 18 X 3/2 = 27

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