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5, 6, 9, 15, ?, 40

A. 21

B. 25

C. 27

D. 33

Answer: Option B

Solution(By Examveda Team)

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

This Question Belongs to Competitive Reasoning >> Series Completion

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