If you want help with this question then you have to ask it properly.

Anyway this is Geometric Series with sum S

S = (a(1-r^n) ) / (1-r)

a is first term this case 1

r is common ratio here 2

n is number of terms I guess here is 7

So substituting you get

S = 128

But if n is 64 then S would be an extremely large number so please check the question.

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