3. A fleet of nine taxis is to be dispatched to three airports in such a way that three go to airport A, five go to airport B, and one goes to airport C. Note that each taXi can be dispatched to only one airport. (8 points) a) In how many distinct ways can this be accomplished? (3 points) b) Suppose that four of the nine taxis are hybrid. What is the probability that at least one of the three taxis dispatched to airport A will be hybrid? (5 points)