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Students at a particular university must be in exactly one of the class ranks: freshman, sophomore, junior, or senior. At this university, 35% of students

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Students at a particular university must be in exactly one of the class ranks: freshman, sophomore, junior, or senior. At this university, 35% of students are freshmen and 30% are sophomores. If a student is selected at random, what is the probability that the student is either a junior or a senior? P(junior or senior) =

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