89. Individual A has a circle of ve close friends (B, C, D, E, and F). A has heard a certain rumor from outside the circle and has invited the ve friends to a party to circulate the rumor. To begin, A selects one of the ve at random and tells the rumor to the chosen individual. That individual then selects at random one of the four remaining individuals and repeats the rumor. Continuing, a new individual is selected from those not already having heard the rumor by the individual who has just heard it, until everyone has been told.

a. What is the probability that the rumor is repeated in the order B, C, D, E, and F?

b. What is the probability that F is the third person at the party to be told the rumor?

c. What is the probability that F is the last person to hear the rumor?