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In a test, an examinee either guesses or...

In a test, an examinee either guesses or copies or knows the answer to a multiple choice question with four choices. The probability that he makes a guess is `1/3` and the probability that he copies the answer is 1/6. The probability that his answer is correct, given that he copied it, is 1/8. Find the probability that he knew the answer to the question, given that be correctly answered it.

A

`17/39`

B

`13/29`

C

`24/29`

D

`24/39`

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The correct Answer is:
C
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