SOLUTION: Hi, I have no idea where to even start. You own 10 CDs. You want to randomly arrange 5 of them in a CD rack. What is the probability that the rack ends up in alphabetical order?

Algebra ->  Permutations -> SOLUTION: Hi, I have no idea where to even start. You own 10 CDs. You want to randomly arrange 5 of them in a CD rack. What is the probability that the rack ends up in alphabetical order?      Log On

There is only 1 way they can be arranged in alphabetical order.

There are 5P5 = 5! = 5*4*3*2*1 = 120 ways they can be arranged
in different orders.

That's 1 way out of 120, or a probability of .

Edwin