Answer the following counting questions.
a. A fair die is tossed twice. Find the probability of getting a 4, 5, or 6 on the first toss and a 1, 2, or 3 on the second toss. [3 marks]
b. If the probabilities are 0.25, 0.20 and 0.10 that a student will get a failing grade in either economics or accounting, or in both, respectively, what is the probability that he will fail at least one of these subjects?
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