there were nine students running in a race. how many different arrangements of first, second ,third, and fourth place are possible?
First place can be filled in 9 ways
second place can be filled in 8 ways (9-1 =8)
Third place can be filled in 7 ways
Fourth place can be filled in 6 ways
so total no: of ways = 9*8*7*6 = 3024 ways
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