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In answering the question on a multiple choice test a student either knows the answer or guesses. Let p be the probability that she knows

In answering the question on a multiple choice test a student either knows the answer or guesses. Let p be the probability that she knows the answer and 1- p that she guesses. Assume that a student who guesses at the answer will be correct with probability 1/m, where m is the number of multiple-choice alternatives. What is the conditional probability that a student knew the answer to a question given that she answered correctly?

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