The total number of different possible arrangements

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Two-year-old Darren is playing with a train set that has an engine and detachable train cars. The letters are glued to the engine and the cars, and the two cars with the letter R are identical. Darren does not know how to spell his name, but he knows that the engine with the letter D must be in front.

The total number of different possible arrangements of all the train cars, with the engine in front, is?

Reference no: EM132432534

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