Lucy is planning to run for an hour, and she's using her iPod for the countdown, so she has to create a 60-minute playlist.
Her iPod contains:
- six 5-minute songs;
- five 6-minute songs;
- four 8-minute songs.
Count the number of possibles playlists where the order doesn't matter.
Details and Assumptions:
- She must use up all 60 minutes for the playlist.