1, 1, 3, 9, 6, 36, 10, 100, , 225 - Number Series - Series Completion - Verbal Reasoning question

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

A. 15

B. 16

C. 20

D. 22

E. None of the above

Answer: A. 15

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.

Posted in: Number Series - Series Completion - Verbal Reasoning