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

The value of `sum_(x=1)^n (-1)^(r+1) (C(n,r))/(r+1)` is equal to

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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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