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[Post New]7 Sep 2007 20:51:56 IST
    Subject: plz solve this series .........
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tango_goat (143)

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Olaaa!! Perrrfect answer. 19  [43 rates]
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ans=sum of all squares of 1st n natural numbers/sum of 1st n natural numbers
=2*n(n-1)(2*n-1)/6n(n-1)
=(2*n-1)/3
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