Re: Combination List
- To: mathgroup at smc.vnet.net
- Subject: [mg77912] Re: Combination List
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Tue, 19 Jun 2007 06:48:26 -0400 (EDT)
On 6/18/07 at 7:09 AM, BC at gmail.com (Bruno Campanini) wrote:
>I know combinations of 4 elements taken 3 by 3 is 4, that is
>Binomial[4,3] = 4 How can I get the list:
>1 2 3 1 2 4
>1 3 4
>1 4 2
>The same way I get permuations list from Permutations[{...}] ???
The last line above should be 2 3 4 for the set of combinations
of 3 of 4 items rather than what you have posted. One way (not
necessarily the most computationally efficient) would be
In[5]:= Union[Sort /@ Permutations[Range[4], {3}]]
Out[5]= {{1, 2, 3}, {1, 2, 4}, {1, 3, 4}, {2, 3, 4}}
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