Instructions

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

Question 98

7, 8, 17, 42, ?

Solution

Look at the terms given in the series 7, 8, 17, 42
The difference between the consecutive terms is 1, 9 and 25. These are perfect squares of odd numbers.

Hence, the next difference will be 49 and the term to come next will be 42+49 = 91


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