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Mathematics, 11.09.2019 02:10 dramaqueenactr2040

The route used by a certain motorist in commuting to workcontains two intersections with traffic signals. the probabilitythat he must stop at the first signal is .4, the analogousprobability for the second signal is .5, and the probability thathe must stop at least one of the two signals is .6. what is theprobability that he must stop.
a.) at both signals?
b.) at the first signal but not at the second one?
c.) at exactly on signal?

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