Talk:2000 AIME II Problems/Problem 5

Solution incorrect?

The problem statement says that the order that the rings are put on is significant, so the balls and urns solution is invalid here.

Actually, the other way around, if the order of the rings is unimportant, then it would be an issue. As is, multiplying by $5!$ allows us to account for all permutations of the rings (perhaps the word "colors" through you off?) Azjps (talk) 23:08, 20 December 2008 (UTC)