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यदि a(k)=(1)/(k(k+1)) , जबकि k = 1,2,3,4...

यदि `a_(k)=(1)/(k(k+1))` , जबकि k = 1,2,3,4,...,n, तब `(sum_(k=1)^(n)a_(k))^(2)` का मान है

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