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Topic: Permutation problems
Replies: 13   Last Post: Aug 12, 2013 2:23 PM

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Ben Brink

Posts: 198
From: Rosenberg, TX
Registered: 11/11/06
RE: Permutation problems
Posted: Aug 11, 2013 7:32 PM
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Would like to comment, but I never received either of the original problems!



> Date: Sun, 11 Aug 2013 16:00:13 -0400
> From: discussions@mathforum.org
> To: discretemath@mathforum.org
> Subject: Re: Permutation problems
> The same fish/rat logic (inclusion/exclusion) needs to be applied to the second problem as well. For example, 9876450123 has been counted three times.
> I believe the solution is:
> 7!+8!+7! - (5!+4!+5!) + 2!

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