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If the sum of n terms of the series (...

If the sum of n terms of the series
`(2n+1)/(2n-1)+3((2n+1)/(2n-1))^2+5((2n+1)/(2n-1))^3 +....`
is 820 then the value of n is _______

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Verified by Experts

The correct Answer is:
` = (4n^(2)-1)/4 . (4n)/(2n-1) = n(2n+1)`
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