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 Simple Problem:

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AIME15
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PostSubject: Simple Problem:   Wed Aug 13, 2008 2:48 pm
Ed, Edd, and Eddy want to go to the movie theater. In how many orders can they sit in?

Answer: Ed has 3 choices, Edd has 2, and Eddy has one. So our answer is 3*2*1=6.

Note: 3*2*1 is the same as 3!. In general, n!=n*(n-1)(n-2)...*2*1.
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Dojo
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PostSubject: Re: Simple Problem:   Wed Aug 13, 2008 4:11 pm
Hmm...
Let me latexify that


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xoangieexo
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PostSubject: Re: Simple Problem:   Thu Aug 14, 2008 5:42 am
You should note that it is called a factorial.
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