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1/(1*2*3)+3/(2*3*4)+5/(3*4*5)+.....n...

`1/(1*2*3)+3/(2*3*4)+5/(3*4*5)+.....n`

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Find sum the series (n)/(1.2*3)+(n-1)/(2.3*4)+(n-2)/(3.4*5)+......... up to n terms..-

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