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Series Completion
5,6,9, 15,?, 40
21
25
27
33
Correct Answer:
25
Explanation:
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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