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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 the gets the correct answer to a question, then find the probability that he was guessing.

A

`(1)/(9)`

B

`(36)/(37)`

C

`(1)/(37)`

D

`(37)/(40)`

Text Solution

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The correct Answer is:
C
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