dstebbins 11 Posted November 21, 2010 You have nine unique items. You must put them in groups of three, no more no less. Each unique item can be in more than one group, but cannot occupy two spots in the same group. How many possible groupings are there? I hope I'm making sense. 0 Share this post Link to post Share on other sites
Shadow 67 Posted November 21, 2010 I'm assuming order doesn't matter. First, read about combinations. Also have a look here, I think it explains the concepts behind combinations nicely. Once you've done that, try solving it on your own. If you still need help, I'll be happy to point you in the right direction. 0 Share this post Link to post Share on other sites
khaled 13 Posted January 20, 2011 (edited) A quick guess gives me ... P = (3 * 3) + (3 * 2) + (3 * 1) but this might be wrong ! Edited January 20, 2011 by khaled 0 Share this post Link to post Share on other sites
