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Probability that Americans have flown in an airplane

1. Suppose that 47% of Americans have flown in an airplane at least once and the 28% of all Americans have ridden on a train at least once. What is the probability that a randomly selected American has either ridden on a train or flown in an airplane? Can this problem be solved? Under what conditions can it be solved? If the problem cannot be solved, what information is needed to make it solvable?

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This problem cannot be solved with the information provided. In order to solve this problem, we ...