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A multiple-choice test consists of 9 questions. Each question has answer choices ofa, b, c,and d, and only one of the choices is correct. If

A multiple-choice test consists of 9 questions. Each question has answer choices ofa, b, c,and d, and only one of the choices is correct. If a student randomly guesses on each question, what is the probability that she gets at least 3 of them correct?

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