The sum of the series 1+3/2+7/4+15/8+3...

The sum of the series
`1+3/2+7/4+15/8+31/16+…` upto n terms is equal to

A

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

B

`2-1/2^n`

C

`2+1/2^n`

D

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

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The correct Answer is:

A

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