An MP3 player is loaded with 60 musical selections: 30 rock selections, 15 jazz selections, and 15 blues selections. The player is set on "random play," so selections are played randomly and can be repeated. What is the probability of each of the following events?
a. The first four selections are all jazz.
b. The first five selections are all blues.
c. The first selection is jazz and the second is rock.
d. Among the first four selections, none is rock.
e. The second selection is the same song as the first.