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

In an entrance test there are multiple choice questions, with four pos

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

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

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