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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.

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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.

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