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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, 1, 3, 9, 6, 36, 10, 100, , 225

Option:
A. 15
B. 16
C. 20
D. 22
Answer: A . 15

Justification:

The given sequence is a combination of two series :
I.    1, 3, 6, 10, (....)
II.   1, 9, 36, 100, 225
The patternin I is + 2, + 3, + 4,...
The numbers in II are squares of the corresponding numbers of I.
.'. Missing number = 10 + 5 = 15.


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