different arrangements

Algebra
Tutor: None Selected Time limit: 1 Day

there were nine students  running in a race. how many different arrangements of first, second ,third, and fourth place are possible?  

Jun 2nd, 2015

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

Please let me know if you have any questions and best me if you are satisfactory.

Jun 2nd, 2015

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