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Question 1: Suppose the probability that at least one of two machines remain functioning until the end of year 2021 is =. What is the

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Question 1: Suppose the probability that at least one of two machines remain functioning until the end of year 2021 is =. What is the probability that both machines break down by 2021? (a) (b) (c) (d) None of the above (e) There is not enough information to answer the above problem Answer: (a) P(A and B) = 1 - P(A or B)

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