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[quad Lt(1.sum(r=1)^(n)r+2*sum(r=1)^(n-1...

[quad Lt(1.sum_(r=1)^(n)r+2*sum_(r=1)^(n-1)r+3*sum_(r=1)^(n-2)r+......+n.1)/(n^(4))=],[[n rarr oo," b) "(1)/(12)],[" a) "(1)/(24)," id "]]

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