dstebbins Posted November 21, 2010 Share 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. Link to comment Share on other sites More sharing options...
Shadow Posted November 21, 2010 Share 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. Link to comment Share on other sites More sharing options...
khaled Posted January 20, 2011 Share 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 Link to comment Share on other sites More sharing options...
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