<p>Given twenty couples, how many different three member groups can be fromed that do not contain both members of any of these couples?</p>
<p>Once again I began by setting up two pairs. I used the alphabet because it was easier. For example, couple Aa, couple Bb, couple Cc, etc. Next I began putting them in groups of three. ABC, ABc, AbC, etc until I went through all of the twenty pairs. Any help would be appreciated.</p>
<p>(I'm sorry but I cannot find my other message anywhere so I had to start a new one.)</p>
<p>You can find links to all your earlier posts (or all posts by any other user) by clicking on [Search] in the dark-blue toolbar at the top of the screen, then on [Advanced Search]. Under [User name], type in the username you want to search for, then click on [Search now] at the bottom of the screen.</p>
<p>Following that process, here's the link to your earlier post + answers to it:
<a href="http://talk.collegeconfidential.com/showthread.php?p=1224687#post1224687%5B/url%5D">http://talk.collegeconfidential.com/showthread.php?p=1224687#post1224687</a></p>