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From a survey involving 2,000 students at a large university, it was found that 1,300 students...

From a survey involving 2,000 students at a large university, it was found that 1,300 students had classes on Monday, Wednesday, and Friday, 1,500 students had classes on Tuesday and Thursday, and 800 students had classes every day. If a student at this university is selected at random, what is the (empirical) probability that the student has classes only on Tuesday and Thursday?

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