Question

Sam is playing songs on her mp3 player. She has 7 hip-hop songs, 9 rock songs, and 7 pop songs. If she has the mp3 player play the songs at random without repeating, what is the probability that the first song will be a rock song and the second song will be a hip-hop song?

Answer 1

What is (9/23)(7/22) ?
assuming that the player will not play the same song two times in a row.

Answer 2

If there are N songs in total, then
P(rock,hip) = #rock/N * #hip/(N-1)