(a) What is the probability that the student is both a sophomore and a chemistry major?

(b) Given that the student selected is a chemistry major, what is the probability that he is also a sophomore?

Question:
# Suppose that a certain college class contains 45...

(a) What is the probability that the student is both a sophomore and a chemistry major?

(b) Given that the student selected is a chemistry major, what is the probability that he is also a sophomore?

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