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In an entrance test, there are multiple ...

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

`37//40`

B

`1//37`

C

`36//37`

D

`1//9`

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The correct Answer is:
B
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