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The sum to n terms of the series 1/2 + 3...

The sum to `n` terms of the series `1/2 + 3/4 + 7/8 + 15/16 + .......` is

A

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

B

1

C

`n - 1`

D

`1 + 2^(-n)`

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The correct Answer is:
A
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