Four friends board an airliner just before departure time. There are only 12 seats left, 3...

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Four friends board an airliner just before departure time. There are only 12 seats left, 3 of which are aisle seats. How many ways can the 4 people arrange themselves in available seats so that at least one of them sits on the aisle? The 4 people can arrange themselves in ways. LEO Four friends board an airliner just before departure time. There are only 12 seats left, 3 of which are aisle seats. How many ways can the 4 people arrange themselves in available seats so that at least one of them sits on the aisle? The 4 people can arrange themselves in ways. LEO

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