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The value of sum(r=1)^(n+1)(sum(k=1)^n^k...

The value of `sum_(r=1)^(n+1)(sum_(k=1)^n`^kC_(r-1))` (where `r, k, n in N`) is equal to

A

`2^(n+1)-2`

B

`2^(n+1)-1`

C

`2^(n+1)`

D

None of these

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The correct Answer is:
A
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