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Assume the only grades possible in a history course are A, B, C, or lower than C. The probability that a randomly selected student will get an A

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Assume the only grades possible in a history course are​ A, B,​ C, or lower than C. The probability that a randomly selected student will get an A in the course is 0.27​, the probability that a student will get a B in the course is 0.28 and the probability that a student will get a C in the course is 0.29 a. What is the probability that a student will get an A OR a​ B? b. What is the probability that a student will get an A OR a B OR a​ C? c. What is the probability that a student will get a grade lower than a​ C?

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Assume the only grades possible in a history course are​ A, B,​ C, or lower than C. The probability that a randomly selected student will get an A in the course is 0.27​, the probability that a student will get a B in the course is 0.28 and the probability that a student will get a C in the course is 0.29 a. What is the probability that a student will get an A OR a​ B? b. What is the probability that a student will get an A OR a B OR a​ C? c. What is the probability that a student will get a grade lower than a​ C?

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