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Find the sum to n terms of the series ,(...

Find the sum to n terms of the series ,`(1)/(1.2)+(1)/(2.3)+(1)/(3.4)+....` ?

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OSWAAL PUBLICATION-SAMPLE PAPER 4-EXERCISE
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  20. Find the sum to n terms of the series ,(1)/(1.2)+(1)/(2.3)+(1)/(3.4)+....

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