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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 answer and (1)/(4) be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability (1)/(4) What is the probability that the student knows the answer given that he answer it correctly?

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Answer Text

Answer :
`(12)/(13)`

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