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Freight Train Cars In a train yard there are 7 tank cars, 12 boxcars, and...

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Freight Train Cars In a train yard there are 7 tank cars, 12 boxcars, and 12 flatcars. How many ways can a train be made up consisting of 4 tank cars, 5 boxcars, and 5 flatcars? (In this case, order is not important.)Total number of ways =

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