d) application An engineer is putting together a train with 5 box cars, 3 tank cars, and 4 flat cars. For the box cars he will choose 5 from a group of 10 cars. For the tank cars he will choose 3 from a group of 5 cars. For the flat cars he will choose 4 from a group of 9 cars. How many different combinations are possible for the group of 12 cars selected?

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