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[" 67.Let "S(1)=(1)/(1^(3))+(1+2)/(1^(3)...

[" 67.Let "S_(1)=(1)/(1^(3))+(1+2)/(1^(3)+2^(3))+...+(1+2+...+n)/(1^(3)+2^(3)+...+n^(3));n=1,2,3],[" Then,"S_(n)" is not greater than "],[[" (a) "(1)/(2)," (b) "1," (c) "2," (d) "4]]

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