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A student's grade in a course is determined by her score on two exams. The probability that she passes the first exam is 0.85, the probability that she passes the second exam is 0.80, and the probability that she passes both exams is 0.78. What is the probability that she passes at least one of the exams?
Correct Answer: C
Let A denote the event she passes the first exam and B denote the event she passes the second exam, then P(A or B) = P(A) + P(B) - P(A and B) = 0.85 + 0.80 - 0.78 = 0.87.