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

The value of `sum_(r=1)^n(-1)^(r+1)("^n C r)/(r+1)` is equal to a.`-1/(n+1)` b. `1/n` c. `1/(n+1)` d. `n/(n+1)`

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