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

explain this

Your Answer

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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