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[" C-13.If "a(n)=sum(r=0)^(n)(1)/(n(r)),...

[" C-13.If "a_(n)=sum_(r=0)^(n)(1)/(n_(r))," the value of "sum_(r=0)^(n)(n-2r)/(n_(r))" is: "],[[" (1) "(n)/(2)a_(n)," (2) "(1)/(4)a_(n)," (3) nan "]]

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