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Re: Combinatorics question

• To: mathgroup at smc.vnet.net
• Subject: [mg3322] Re: [mg3288] Combinatorics question
• From: Robert Pratt <rpratt at math.unc.edu>
• Date: Mon, 26 Feb 1996 02:56:20 -0500
• Sender: owner-wri-mathgroup at wolfram.com

Open the Combinatorica Package.

<<DiscreteMath`Combinatorica`

Then use the command KSubsets.

KSubsets[list, 6]

where list is your list of twenty elements.

KSubsets returns the 38760 combinations in lexicographic order.

Rob Pratt
Department of Mathematics
The University of North Carolina at Chapel Hill
CB# 3250, 331 Phillips Hall
Chapel Hill, NC  27599-3250

rpratt at math.unc.edu

On Fri, 23 Feb 1996 PESCC at CUNYVM.CUNY.EDU wrote:

> Can somenone help me find the following:
>  
> I have a list of 20 numbers, and I would like to list all the
> combinations of these numbers taken 6 at a time.  The Binomial
> function tells me there are 38760, but I would like to actually
> see all of them.
> Thanks in advance for your help.
> 
> 

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