The sum of the first n terms of the seri...

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

A

`2^(n)-n-1`

B

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

C

`n+26(-n)-1`

D

`26(n)-1`

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The correct Answer is:

B

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