Instructions

What should come in place of the question mark ? in the following number series ?

Question 63

1, 2, 6, 21, ??, 445, 2676

Solution

Each number in the given series is following the below pattern.

2 = 1*1 + 1
6 = 2*2 + 2
21 = 3*6 + 3
2676 = 6*445 + 6

The number in the question mark will be 4*21 + 4 = 88

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