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The route used by a commuter in going to work has two intersections with traffic signals....

The route used by a commuter in going to work has two intersections with traffic signals. The probability the commuter must stop at the first signal is 0.5 and the probability of stopping at the second signal is 0.4. The probability of stopping at at least one of the two signals is 0.5. What is the probability that the commuter must stop at the first traffic signal and the second traffic signal?

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