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[" If "S(n)=sum(r=0)^(n)1''C(r)" and "t(...

[" If "S_(n)=sum_(r=0)^(n)1''C_(r)" and "t_(n)=sum_(r=0)^(n)r'(C_(r)," then "t_(n)/S_(n)" is equal ")],[" to "(1)/(2)n],[[" (c) "n-1," (d) "(2n-1)/(2)]]

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