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In an entrance test there are multiple choice questions. There are four possible answers to each questions, of which one is correct. The probability that a student knows the answer to a question is 9/10. If he gets the correct answer to a question, then the probability that he was guessing is

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In an entrance test there are multiple choice questions. There are four possible answers to each questions, of which one is correct. The probability that a student knows the answer to a question is 9/10. If he gets the correct answer to a question, then the probability that he was guessing is




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