Talk:Combinations

Combinations with repetitions

The formula for combinations with repetitions is wrong. Can some body correct it with the right formula from http://en.wikipedia.org/wiki/Multiset_coefficient#Counting_multisets.

--Raghu (talk) 13:51, 23 May 2013 (UTC)

We can't talk about correctness of the equation without also talking about the definitions of the terms which appear in those equations. A few quick tests show that both the equation on the page for combinations and some of the wikipedia expressions are using different definitions from what would be appropriate for the "3" and "5" used in the initial example for this task. For example, if we look at all the combinations of five things drawn from a set of 5, we would expect only one valid combination (all of them). --Rdm (talk) 14:19, 23 May 2013 (UTC)