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A multiple choice test is given, in which each question has 3 possible answers. As part of an experiment in how students approach test-taking, the

A multiple choice test is given, in which each question has 3 possible answers. As part of an experiment in how students approach test-taking, the probabilities for getting answers correct just by guessing are calculated. If the test has 20 questions, what is the probability of getting 4 questions correct?

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