2005 AMC 10A Problems/Problem 9
Revision as of 18:48, 1 August 2006 by Xantos C. Guin (talk | contribs) (added problem and solution)
Problem
Three tiles are marked and two other tiles are marked . The five tiles are randomly arranged in a row. What is the probability that the arrangement reads ?
Solution
There are distinct arrangments of three 's and two 's.
There is only distinct arrangement that reads
Therfore the desired probability is