2. Let X be the number of black mice chosen. Calculate 1 - Pr(X = 0) - Pr(X = 3). (A tree diagram easily gives these probabilities. It can also be done by listing the eight possible outcomes and getting the probability of each. It can also be done using the Hypergeometric distribution.).

3. Many approaches are possible. The simplest is to note that there since there are 5 cities there's a 1 in 5 chance that A will be last ....