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

[" 17.If "a_(n)=sum_(r=0)^(n)(1)/(nC_(r))" ,then "sum_(r=0)^(n)(r)/(n)" equals - "],[[" (A) "(n-1)a_(n)," (B) "na_(n)," (C) "na_(n)/2," (D) none of thess "]]

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