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Among 500 freshmen pursuing a business degree at a university, 338 are enrolled in an economics course, 238 are enrolled in a mathematics course, and 158 are enrolled in both an economics and a mathematics course. What is the probability that a freshman selected at random from this group is enrolled in each of the following? (Enter your answers to three decimal places.)
(a) exactly one of these two courses
(b) neither an economics course nor a mathematics course

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