SOLUTION: In how many ways can a student arrange 20 CDs in 4 CD player?

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Question 439308: In how many ways can a student arrange 20 CDs in 4 CD player?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
20 cd's in a 4 cd player equals 20 combined 4 at a time, or 20C4:
20C4=20x19x18x17x16!/4x3x2x16!=5x19x3x17=4845 different ways to play 20 cd's in a 4 cd player.