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Sum of first 'n' terms of the series 3/...

Sum of first 'n' terms of the series `3/2+5/4+9/8+17/16+...`

A

`n+1-2^(n)`

B

`1+2^(-n)`

C

`2^(n)-1`

D

`2^(n)-n+1`

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The correct Answer is:
A
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