The sum 1+3+7+15+31 + cdots to n terms ...

The sum `1+3+7+15+31 + cdots ` to n terms is

A

`2^(n)-2-n`

B

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

C

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

D

None of these

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The correct Answer is:

C

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