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[" 25.If "a(n)=sum(r=0)^(n)(1)/(^nC(r)),...

[" 25.If "a_(n)=sum_(r=0)^(n)(1)/(^nC_(r))," then "sum_(r=0)^(n)(r)/(^nC_(r))" equals: "],[[" (a) "(n-1)a_(n)," (b) "na_(n)],[" (c) "(1)/(2)na_(n)," (d) None of these "]]

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