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.
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