Question

what will come next in following series? 17,35,72,147....​

Answer 1

Answer:

This formula should work to determine all terms in the series given that the first term is 17.

i.e. a(0) = 17, a(n) = a(n-1)*2 + n.

The series becomes

a(1) = a(0) * 2 + 1 = 17 * 2 + 1 = 35

a(2) = a(1) * 2 + 2 = 35 * 2 + 2 = 72

a(3) = a(2) * 2 + 3 = 72 * 2 + 3 = 147

a(4) = a(3) * 2 + 4 = 147 * 2 + 4 = 298

and so on,

The answer is 298

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