The sum to n terms of the series (1)/(...

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

A

`2 ^(n) - n -1`

B

`1 - 2 ^(-n)`

C

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

D

`2 ^( n) -1`

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The correct Answer is:

C

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