Instructions

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

Question 98

8, 17, 42, 91, ??

Solution

The difference between consecutive terms of the number series are squares of odd natural numbers.

For example, 17-8 = 9
42-17 = 25
91-42 = 49

Hence, the number to come next is 91+81 = 172

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