SOLUTION: The probability that a certain type of machine will broke down in the first month of operation is 0.1. If a firm has two such machines which are installed at the same time, find th

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Question 1163615: The probability that a certain type of machine will broke down in the first month of operation is 0.1. If a firm has two such machines which are installed at the same time, find the probability that, at the end of first month, just one has broken down
Answer by ikleyn(52834) About Me  (Show Source):
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    P = P(A is broken, B is not) + P(B is broken, A is not) = 0.1*(1-0.1) + 0.1*(1-0.1) = 2*0.1*0.9 = 0.18.    ANSWER