Combinations
- To: mathgroup at smc.vnet.net
- Subject: [mg30769] Combinations
- From: "Dana" <ng_only at hotmail.com>
- Date: Sun, 9 Sep 2001 20:43:02 -0400 (EDT)
- Organization: BELLSOUTH.net
- Sender: owner-wri-mathgroup at wolfram.com
Hello. I have Mathematica 4.1 In a Program like Excel, or a hand-held calculator, one can return the number of combinations and permutations. However, I can not find an equivalent function in Mathematica. For example, Permutations[ ] returns a long list of all the "Actual" permutations. I am looking for just the final number. If there is one, could you include 'how' you found it. I have looked everywhere. I know DiscreteMath`Combinatorica` has some stuff in it, but the Help system appears not to explain many of them. I can write a custom function, but I am curious to find out if this function is built in to Mathematica. I hope the answer is not to take the Length[ ] of a rather long list. TIA. Dana (I posted this question a month ago, but it never showed up in the newsgroup, or in the archives. I hope I am not doing something wrong.)
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