can use 3 reviews reviews be selected? Explain your answer. 3. A school musical director can select 2 musical plays to present next year. (10pts) One will be presented in the fall, and one will be presented in the spring. If she has 9 to pick from, how many different possibilities are there? Explain your answer. 4. A box contains 24 transistors, 4 of which are defective. If 4 are sold at random, find the following probabilities. a) Exactly 2 are defective. b) None is defective. c) At least 1 is defective. (15pts). d and (10pts)