In a test, a student either guesses or c...

In a test, a student either guesses or copies or knows the answer to a multiple choice question with four choices having one correct answer. The probability that he guesses the answer is `1/3` and the probability that he copies it is ` 1/12` . the probability that his answer is correct given that he copied it is `1/6` the probability that he knew the answer, given that he has correctly answered it, is

`6/7`

`15/49`

`7/12`

`10/13`

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