What should come in place of the question mark 39 39 in the following number series 6 5 8 21 395 ........

Quantitative Aptitude(IBPS CL) Number series

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

6, 5, 8, 21, ?, 395

This questions was previously asked in

IBPS Clerk (Prelims)

100

110

120

Correct option:4

Given series: 6, 5, 8, 21, ?, 395.

The series follows the following pattern:

6 × 1 - 1 = 5
5 × 2 - 2 = 8
8 × 3 - 3 = 21.
21 × 4 - 4 = 80
80 × 5 - 5 = 395

Hence 80 will be at the missing number.

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