A student is selected at random from the class. what is the, Ask an Expert

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Suppose that a certain college class contains 35 students. Of these,23 are juniors,13 are economics majors, and 9 are neither. A student is selected at random from the class.

(a) What is the probability that the student is both a junior and an economics major?
(b) Given that the student selected is a junior, what is the probability that he is also an economics major?

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