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Sum of the first n terms of the series 1...

Sum of the first n terms of the series `1/2+3/4+7/8+15/16+ . . .` is equal to

A

`n-1+(1/2)^(n)`

B

`n+(1/2)^(n)`

C

`n-1-(1/2)^(n)`

D

none of these

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The correct Answer is:
A
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