3.2 The event A is contained in C. So when A occurs, C also occurs; therefore P(C | A) = 1. Since C^c = {123, 321} and A ? B = {123, 321, 312, 213}, one can see that two of the four outcomes of A ? B belong to C^c as well, so P(C^c | A ? B) = 1/2.
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