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 1st, 2015

3 three arrangement difference

Jun 1st, 2015

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Jun 1st, 2015
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Jun 1st, 2015
Dec 4th, 2016
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