Among 500 freshmen pursuing a business degree at a university, 349 are enrolled in an economics course, 235 are enrolled in a mathematics course, and 136 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) an economics and/or a mathematics course (b) exactly one of these two courses (c) neither an economics course nor a mathematics course

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