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Find the missing term 5 6 9 15 40

This question belongs to Competitive Reasoning Number Series Completion
Number Series Completion
?

Find the missing term: 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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