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In answering a question on a multiple r. choice test, a student either knows the answer or guesses.

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In answering a question on a multiple r. choice test, a student either knows the answer or guesses. Let 3 4 be the probability that he knows the answer 1 4 and 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 answered it correctly ? Select the correct answer from above options

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E1: student knows the answer E2 : student guesses the answer

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