5, 6, 9, 15, ?, 40 Options: A . &nbsp21 B . &nbsp25 C . &nbsp27 D . &nbsp33

5, 6, 9, 15, ?, 40

Question

5, 6, 9, 15, ?, 40

Options:

A . 21

B . 25

C . 27

D . 33

Answer: Option B
The pattern is + 1, + 3, + 6,....., i.e. + 1, + (1, + 2), + (1 + 2 + 3),.....
So, missing term = 15 + (1 + 2 + 3 + 4) = 25.

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