Question 1057792
Since the order of the three selected CDs does not matter, this problem is asking for 
the number of combinations.


{{{C(20, 3) = 20! / (3!(20 - 3)!) = 20! / (3!17!) = 1140}}}


There are 1140 ways to select a set of 3 CDs from the group of 20 CDs.