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

The value of `sum_(r=1)^(n+1)(sum_(k=1)^n "^k C_(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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