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In answering a question on a multiple ch...

In answering a question on a multiple choice test, a student either knows the answer or guesses. Let `3/4` be the probability that he knows the answers and `1/4` be the probability that he guesses. Assuming that a student who guesses the answer will be correct with probability `1/4` What is the probability that the student knows the answer, given that he answered it correctly?

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The correct Answer is:
`12/13`
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