This is correct if the order of the 10 songs in not important.Your mobile music DJ business has: 6 rap, 10 rock, 6 alternative,
8 oldies and 5 C&W cd singles.
How many different 10-song sets can the DJ play at a party
if she plays exactly two singles from each?
Here is how I came up with an answer:
. . choices.
If the order of the songs is considered, mutilply by 10-factorial.