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Table of Exercise 2-57 Complete Response Total Ribavirin plus interferon alfa 16 21 Interferon alfa 6 l9 Untreated controls 0 20 2-80. Suppose that a patient is selected randomly from the those described in Exercise 2-57. Let A denote the event that the patient is in the group treated with interferon alfa, and let B denote the event that the patient has a complete response. Determine the following probabilities. (a) P(A) (b) 10(3) (0) P(AnB) (d) P(AUB) (e) P(A'UB)