Date: Feb 5, 2013 2:11 PM
Author: Scott Berg
Subject: Re: how many ways to pick two teams of 10 out of a group of 20 people


"G Patel" <gaya.patel@gmail.com> wrote in message 
news:13ae8675-030d-4087-94e6-4490d6b7662c@googlegroups.com...
> Is it 20 choose 10 or do I have to divide by 2?
>
>

are each of the people, unique ?

are there any biological twins dressed alike ?

are any of  these people identical to each other ?