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Free math help message board?

Original post made by rusty at math, another community, on Jul 14, 2008

Can someone please direct me to a math help message board that would allow me to post a math question and have it answered fairly quickly without having to register or pay a fee?

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Comments (3)

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Posted by An Engineer
a resident of Downtown North
on Jul 14, 2008 at 5:33 pm

The keyword is Combinatorial Analysis. This link may help: Web Link


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Posted by Jarred
a resident of Midtown
on Jul 14, 2008 at 6:47 pm

If you have N objects, the number of possible pairings is (N*(N-1))/2.

Explanation: you have a choice of N objects for the first element of the pairing. Then you have a choice of N-1 objects for the second element. This yields N*(N-1) combinations. But each possible pairing will be generated twice this way (eg, as AB and as BA) so you have to divide by two.

So, the number of possible pairings of 6 elements is (6*5)/2 = 15.


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Posted by rusty at math
a resident of another community
on Jul 14, 2008 at 9:57 pm

Thanks very much!


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