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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, 6, 15, , 45, 66, 91

Option:
A. 25
B. 26
C. 27
D. 28
Answer: D . 28

Justification:

The pattern is + 5, + 9, ..., + 21, + 25
.'. Missing number = 15 + 13 = 28.

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