An express bus leaves Kingston with 18 passengers. It stops at Ocho Rios, where
another 12 passengers join the bus. At Montego Bay it stops again and 20 more
passengers get on board. When the bus arrives at its destination, Negril, all the
passengers get off and one is chosen at random to be interviewed about the journey.
Find the probabilities that this passengers
was on the bus for the whole journey.
got on the bus at Ocho Rios,
got on the bus at Ocho Rios or Kingston,
got on the bus at Ocho Rios or Montego Bay.
