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Find the sum of n terms of the series th...

Find the sum of `n` terms of the series the `r^(th)` term of which is `(2r+1)2^r`.

A

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

B

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

C

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

D

None of these

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The correct Answer is:
B
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