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Re: Combination List

• To: mathgroup at smc.vnet.net
• Subject: [mg77993] Re: Combination List
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Thu, 21 Jun 2007 05:37:16 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <f55qci$k58$1@smc.vnet.net> <f58bk7$6ve$1@smc.vnet.net> <f5arsg$9aq$1@smc.vnet.net>

Bruno Campanini wrote:
> "Jean-Marc Gulliet" <jeanmarc.gulliet at gmail.com> wrote in message 
> news:f58bk7$6ve$1 at smc.vnet.net...
> 
>> I believe the last line is a typo (otherwise your request does not make
>> any sense).
> 
> Yes it is.
> Thank you Jean-Marc and thanks to the other fellows.
> I got a number of good solutions to my question.
> 
> May I go on...
> What if I can have one or more repeated elements in subsets?
> That is the number of combinations of 3 elements out of 4
> - with one or more duplicated elements - is Binomial[4+3-1,3] = 20
> 
> How can I get the list?
> 
> Bruno
> 

You should investigate the package Combinatorica. For instance, from the 
  documentation center

Combinatorica/tutorial/Combinatorica

or from the web

http://reference.wolfram.com/mathematica/Combinatorica/tutorial/Combinatorica.html

is a good place to start with it.

Regards,
Jean-Marc