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

[" 61.The value of "sum_(r=1)^(n)(-1)^(r+1)(^(n)C_(r))/(r+1)" is equal to "],[[" (1) "-(1)/(n+1)," .(2) "-(1)/(n)],[" (3) "(1)/(n+1)," (4) "(n)/(n+1)]]

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