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[Post New]22 Mar 2007 23:14:16 IST
    Subject: IIT-JEE
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vish0001 (493)

Blazing goIITian

Olaaa!! Perrrfect answer. 79  bad job dude!! I dont approve of this answer! 2  [132 rates]
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hey this can be done as follows

the given series is summation of the followinf series from 0 to n

(1 + a + arsquare ................ ar raised to power k-1) x to power k-1
find the sum of the the abover seriees first and then summate it over the whole range using possibly properties of GP
hope u understood 1


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