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suppose that a certain college class contains 65 students. of these, 31 are sensors, 33 are biology majors, and 7 are pether. A student is selected at ferdum ToIn the class. (a) What is the probability that the student is both a servor and a biology major? (b) Given that the student selected is a senior, what is tre probability that she is also a blology major? Write your responses as fractions. (If necessary, consult a list of formulas.) (3) 0 X