Sum of C(3n,3k)

Tue Jul 04, 2006 5:47 am, by mathematica

Here no one understands what a combinatorial proof is...

http://www.artofproblemsolving.com/Forum/viewtopic.php?t=99008

what I mean by a combinatorial proof is a proof that is not based only on algebra but also uses some combinatorial stuff like the inclusion/exclusion principle.

Newton's Law of Gravitation

Filed on Sun Nov 13, 2005 8:04 am, by mathematica

Please have a look at:
http://www.artofproblemsolving.com/Forum/viewtopic.php?p=251632&highlight=#251632
any opinions?

Welcome!

Filed on Thu Aug 18, 2005 6:59 am, by mathematica

In this blog I'm going to to about the posts that have remanied without an answer in the mathlinks original website Smile

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  • Joined: 01 Jun 2005
  • Location: Tehran, Iran
  • Occupation: Student
  • Interests: Mathematics

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  • Blog started: 18 Aug 2005
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