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In a class of 60 students, there are 15 from mathematics department, 25 from economic department, and 20 from computer science department. One student is

In a class of 60 students, there are 15 from mathematics department, 25 from economic department, and 20 from computer science department. One student is selected at random. What is the sample space of this experiment? Construct a random variable X for this sample space and then find its space. Further, find the probability mass function of this random variable X

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