SOLUTION: All Seasons Plumbing has two service trucks that frequently need repair. If the probability the first truck is available is 0.73, the probability the second truck is available is 0

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Question 1023102: All Seasons Plumbing has two service trucks that frequently need repair. If the probability the first truck is available is 0.73, the probability the second truck is available is 0.54, and the probability that both trucks are available is 0.42:
What is the probability neither truck is available? (Round your answer to 2 decimal places.)
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
The probability that the first truck OR the second truck is available is 0.73 + 0.54 - 0.42 = 0.85, by the addition law. Hence the probability that both trucks are unavailable is 1-0.85 = 0.15.