Date: Feb 5, 2013 3:20 AM
Author: Virgil
Subject: Re: how many ways to pick two teams of 10 out of a group of 20 people
In article <13ae8675-030d-4087-94e6-4490d6b7662c@googlegroups.com>,

G Patel <gaya.patel@gmail.com> wrote:

> Is it 20 choose 10 or do I have to divide by 2?

>

Work your way up to it.

How many pairs of teams of 1 each from a pool of 2 players?

How many pairs of teams of 2 each from a pool of 4 players?

How many pairs of teams of 3 each from a pool of 6 players?

How many pairs of teams of 4 each from a pool of 8 players?

...

How many pairs of teams of 10 each from a pool of 20 players?

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