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" (a) "(1)/(1.2)+(1)/(2.3)+(1)/(3.4)+...

" (a) "(1)/(1.2)+(1)/(2.3)+(1)/(3.4)+

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For all ngt=1 , prove that , (1)/(1.2) + (1)/(2.3) + (1)/(3.4) + ……+ (1)/(n(n+1)) = (n)/(n+1)

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Sum of n terms of (1)/(1.2) + (1)/(2.3) + (1)/(3.4) + …. is

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