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In an entrance test there are multiple c...

In an entrance test there are multiple choice questions. There are four possible answers to each equation, of which one is correct. The probability that a student knows the answer to a question is `9//10`. If he gets the correct answer to a question, then the probability that the was guessing is

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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DIPTI PUBLICATION ( AP EAMET)-PROBABILITY-EXERCISE-1C
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  11. Three boxes numbered, I, II, III contain balls as follows {:(,"White...

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  12. A bag A contains 2 white and 3 red balls and a bag B contains 4 white ...

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  13. Fpr L=1,2,3 the box Bk contains k red balls and (k+1) white balls . Le...

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  14. Box A contains 2 black and 3 red balls, while box B contains 3 black ...

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  17. A man speaks truth in 60% cases. He throws a die and reports that it i...

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  18. A man is known to speack the truth 2 out of 3 times . He throws a die ...

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