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[" 52."[(1)/(1times2)+(1)/(2times3)+(1)/...

[" 52."[(1)/(1times2)+(1)/(2times3)+(1)/(3times4)+....+(1)/(99times100)]=?],[" (a) "(1)/(9900)quad " (b) "(99)/(100)]

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(1)/(2)times100

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