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 ?