Instructions

What will come in place of the question mark (?) in the following number series ?

Question 91

7, 9, 12, 16, ??

Solution

The difference between consecutive terms of the series is increasing by 1.

For example, 9-7 = 2
12-9 = 3
16-12 = 4

Hence, the number to come next is 16+5 = 21

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