Question: Two varieties of flu spread through a school one winter. The probability that a student gets both varieties is .18. The probability that a student

Two varieties of flu spread through a school one winter. The probability that a student gets both varieties is .18. The probability that a student gets neither variety is .42. Having one variety of flu does not make a student more or less likely to get the other variety. What is the probability that a student gets exactly one of the flu varieties?

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