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[" 128.If "sum(r=1)^(n)a(r)=(1)/(6)n(n+1...

[" 128.If "sum_(r=1)^(n)a_(r)=(1)/(6)n(n+1)(n+2)" for all "n>1" ,then "],[lim_(n rarr oo)sum_(r=1)^(n)(1)/(a_(r))" is "]

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