There are two traffic lights on Darlene's route from home to work. Let E denote the event that Darlene must stop at the first light, and define the event F in a similar manne the second light. Suppose that P(E) = 0.3, P(F) = 0.3, and P(En F) = 0.12. (a) What is the probability that Darlene must stop at at least one light; that is, what is the probability of the event P(E U F)? (b) What is the probability that Darlene doesn't have to stop at either light? (c) What is the probability that Darlene must stop at exactly one of the two lights? (d) What is the probability that Darlene must stop just at the first light? (Hint: How is the probability of this event related to P(E) and P(En F)? A Venn diagram might he

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