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5 6 9 15 40

This question belongs to Competitive Reasoning Series Completion
Series Completion
?

5, 6, 9, 15, ?, 40

Answer & Solution
Correct 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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