In answering a question on a multiple choice test, a student either...

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In answering a question on a multiple choice test, a student either knows the answer or gusses. Let \( \frac{3}{4} \) be
P the probability that he knows the answer and \( \frac{1}{4} \) be the probability that he guesses. Assuming that a

W student who guesses at the answer will be correct with probability \( \frac{1}{4} \) vhat is the probability that the student - knows the answer given that he answered it correctly?
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