Question 1121312
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The probability that at least one bus is working (either bus is working) is


    P(A U B) = P(A) + P(B) - P(AnB) = 0.6 + 0.58 - 0.45 = 0.73.



The probability that NEITHER bus is working is the complement to it


    P(neitherA norB) = 1 - 0.73 = 0.27.
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Solved.