5,6,9,15,?,40 a)25 b)33 c)27 d)21

explain this

Your Answer

Answer: B . 25 
 Justification:
The pattern is + 1, + 3, + 6,...   i.e. + 1, + (1 + 2), + (1 + 2 + 3),...
.'. Missing number = 15 + (1 + 2 + 3 + 4) = 25.

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