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fs(n)=sum(r=0)^(n)(1)/(^nC(r))" and "t(n...

fs_(n)=sum_(r=0)^(n)(1)/(^nC_(r))" and "t_(n)=sum_(r=0)^(n)(r)/(^nC_(r))," then "(t_(n))/(s_(n))=

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