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A mall has two elevators. Let A be the event that the first elevator is busy, and let B be the event that the second

A mall has two elevators. Let A be the event that the first elevator is busy, and let B be the event that the second elevator is busy. Assume that P.A/ D 0:2; P.B/ D 0:3 and P.A \ B/ D 0:06. Find the probability that neither of the elevators is busy.

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