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combinatorial argument
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08-12-2007, 10:06 PM
jay_shark
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Join Date: Sep 2006
Posts: 2,277
Re: combinatorial argument
The identity is n*(n+1)*(2n+1)*(3n^2+3n-1)/30 .
There is no direct way of getting this answer . Just find some polynomial of 5th degree that works out to the above after factoring .
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