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The quickest method to compute the probability that by choosing by chance 3 pupils, one out of each school, at least one of them wears

The quickest method to compute the probability that by choosing by chance 3 pupils, one out of each school, at least one of them wears glasses, is to evaluate the probability that none of them wears glasses. If B is the event that at least one of the 3 pupils wears glasses

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