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Math Forum » Discussions » sci.math.* » sci.math.independent

Topic: how many ways to pick two teams of 10 out of a group of 20 people
Replies: 12   Last Post: Feb 5, 2013 2:20 PM

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Ray Koopman

Posts: 3,347
Registered: 12/7/04
Re: how many ways to pick two teams of 10 out of a group of 20 people
Posted: Feb 5, 2013 2:20 PM
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On Feb 4, 11:45 pm, G Patel <gaya.pa...@gmail.com> wrote:
> Is it 20 choose 10 or do I have to divide by 2?

If the teams are distinguishable -- e.g., if one is the "home" team
and the other is the "visiting" team -- then it's 20_choose_10.
But if there is no such distinction then you divide that by 2.

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