4Tris
4Tris
01.06.2021 • 
Mathematics

There are 12 European cities that Austin would eventually like to visit. On his next vacation, though, he only has time to visit 4 of the cities: one on Monday, one on Tuesday, one on
Wednesday, and one on Thursday. He is now trying to make a schedule of which city he'll visit on
which day. How many different schedules are possible? (Assume that he will not visit a city more
than once.)

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