You have 3 yellow M&M's, 6 blue M&M's, and 9 red M&M's. How many distinct ways are there to arrange these in a line?
(18 choose 3)*(15 choose 6)
(18 choose 6)*(15 choose 3)
(18 choose 9)*(15 choose 6)
(18 choose 9)*(15 choose 3)
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