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In a competitive examination, an examine...

In a competitive examination, an examinee either guesses or copies or knows the answer to amultiple choice question with four choices. The probability that he makes a guess is `1/3` and the probability that he copies the answer is 1/6. The probability that the answer is correct, given that he copiedit, is `1/8`. Find the probability that he knows the answer to the question, given that he correctly answered

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