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Consider randomly selecting a student at a large university, and let A be the event that the selected student has a Visa card, B be the analogous event for MasterCard, and C be the event that the selected student has an American Express card. Suppose that P(A) = .6, P(B) = .4, P(C) = .2, P(A ∩ B) = .3, P(A ∩ C) = .15, P(B ∩ C) = .1, and ?(?∩B∩?) = .08.
a. What is the probability that the selected student has at least one of the three types of cards?
b. What is the probability that the selected student has both a Visa card and a MasterCard but not an American Express card?
c. Calculate and interpret P(B|A).
d. Calculate and interpret P(A|B).
e. If we learn that the selected student has an American Express card, what is the probability that she or he also has both a Visa card and a MasterCard? f. Given that the selected student has an American Express card, what is the probability that she or he has at least one of the other two types of cards?
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