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![[Post New]](/templates/default/images/icon_minipost_new.gif) 31 May 2008 11:02:14 IST
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s=12+2(22)+32+2(42)+52+2(62)..........................n is
when n is odd
when n is even..
i need a short cut for n is odd
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31 May 2008 11:29:01 IST
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n=odd, n(4n^2-4*n+1)
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31 May 2008 12:15:31 IST
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Hey its not very difficult group the terms as
n=even
%2B(2^2%2B4^2%2B6^2%2B...n^2))
=n(n+1)(2n+1)/6+2(2^n/2-1)
n=odd
%2B(2^2%2B4^2%2B6^2%2B...(n-1)^2)) (n/2-1)terms
=n(n+1)(2n+1)/6+2(2^(n/2-1)-1)
cheeeeeerrrrrrrrrssssssssss  
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<SRIRAM.A> on high way of IIT
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