### Home > GC > Chapter 4 > Lesson 4.2.1 > Problem 4-58

4-58.

Renae wonders, “What if I program my MP3 player to randomly play

Assuming that her MP3 player is still programmed as described in problem 4-53, how many combinations of

songs could she listen to? Make a list of all the combinations. Remember that the order of the songs is not important. Your list should include

different combinations.

Compare your answer to part (a) with the number of combinations that she could have with

songs in problem 4-50. Why does it make sense that these are the same? For every two songs that are played, there are automatically three songs that are not.

Therefore, this problem simply switched the list of played songs and unplayed songs.