Al's appliances emplys 10 salespersons, to motivate sales, the store is going to award prizes to the top three sales persons of the month. First prize is a stereo system, 2nd prize is a mp3 player, 3rd is an alarm clock. In how many ways can theses prizes be awarded.

Question

anonymous · Answer

10 people could get the stereo system... after 1 person wins that

9 people could get the mp3 player  after 1 person wins that

8 people could get the alarm clock   

so 10 * 9 * 8 = 720