I had been thinking about this one for awhile now but somehow couldn't come up with anything(adsbygoogle = window.adsbygoogle || []).push({});

Q: Number of ways to select nine 9 marbles from a bag of twelve, where 3 are red, 3 are green, 3 are white, 3 are blue

This question is in the inclusion & exclusion section(but I can't figure out how it's related to I & E..)

any suggestion?

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# Homework Help: Combinatoric question

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