Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Math Topics » discretemath

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

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Ben Brink

Posts: 196
From: Rosenberg, TX
Registered: 11/11/06
RE: Permutation problems
Posted: Aug 11, 2013 7:32 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply
att1.html (0.8 K)

Mark,

Would like to comment, but I never received either of the original problems!

Thanks,

Ben


> 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!





Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.