An environmental services firm presently has bids out on three projects. Let Ai = {awarded project i}, for i = 1, 2, 3, and suppose that P(A1) = .22, P(A2) = .25, P(A3) = .28, P(AinA2) = .11, P(AinA3) = .05, P(AnA3) = .07, P(AinA2nA3) = 01. Express in words each of the following events, and compute the probability of each event: 3.1. Al UA2 3.2. AinA2 3.3. Al U A2 U A3 3.4. A'nAn A3 3.5. AinAn A3