SOLUTION: You own 21 CDs. You want to randomly arrange 9 of them in a CD rack. What is the probability that the rack ends up in alphabetical order?
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Question 1021310: You own 21 CDs. You want to randomly arrange 9 of them in a CD rack. What is the probability that the rack ends up in alphabetical order?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Since there is only one arrangement out of 9! where the CD's are in alphabetical order, the probability that the rack ends up in alphabetical order is 1/9! = 1/362,880.
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