In an entrance test there are multiple choice questions. There are four possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 90%. If he gets the correct answer to a question, then the probability that he was guessing, is

In an entrance test there are multiple choice questions. There are fou

1.	In an entrance test there are multiple choice questions. There are four possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 90%. If he gets the correct answer to a question, then the probability that he was guessing, is
A.	\[\frac{37}{40}\]
B.	\[\frac{1}{37}\]
C.	\[\frac{36}{37}\]
D.	\[\frac{1}{9}\]
Answer» C. \[\frac{36}{37}\]

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In an entrance test there are multiple choice questions. There are four possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 90%. If he gets the correct answer to a question, then the probability that he was guessing, is

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