Problema Solution
A radio disc jockey has songs on this upcoming hour's playlist: are rock songs, are reggae songs, and are country songs. The disc jockey randomly chooses the first song to play, and then she randomly chooses the second song from the remaining ones. What is the probability that the first song is a country song and the second is a reggae song? Write your answer as a fraction in simplest form.
Answer provided by our tutors
not enough information for a decent answer... are there equal number of songs in each category? can the disc jockey repeat picks?
if 'x' represents the number of rock songs and we assume both raggae and country songs are also represented by 'x', then the odds of a random selection from any category at any time is:
1/(3x)
if the jockey can not repeat selections, then '3x' is reduced by one after each pick