[qquad [,L(r=1)^(1)(1)/(n+oo)r+2*sum(r=1...

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

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