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The sum of the serieslebrge (1+2)+(1+2+2...

The sum of the serieslebrge `(1+2)+(1+2+2^(2))+(1+2+2^(2)+2^(3))+..` to `n` term is

A

`2^(n+2)-n-4`

B

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

C

`2^(n+1)-n`

D

`2^(n+1)-1`

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The correct Answer is:
A
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