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[" If "sum(r=1)^(n)t(r)=(1)/(12)n(n+1)(n...

[" If "sum_(r=1)^(n)t_(r)=(1)/(12)n(n+1)(n+2)" then "],[" the value of "sum_(r=1)^(n)(1)/(t_(r))" is "]

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