Question: Consider again the shopper described in Exercise 4. On each purchase, the probability that he will choose the same brand of toothpaste that he chose

Consider again the shopper described in Exercise 4. On each purchase, the probability that he will choose the same brand of toothpaste that he chose on his preceding purchase is 1/3, and the probability that he will switch brands is 2/3. Suppose that on his first purchase the probability that he will choose brand A is 1/4 and the probability that he will choose brand B is 3/4.What is the probability that his second purchase will be brand B?

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