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100 students appeared for two tests, 60 ...

100 students appeared for two tests, 60 passed the first, 50 passed the second and 30 passed both. Probability that a student selected at random has failed in both tests is

A

`0.4`

B

`0.2`

C

`0.3`

D

`0.5`

Text Solution

Verified by Experts

The correct Answer is:
B
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MARVEL PUBLICATION-PROBABILITY-MULTIPLE CHOICE QUESTIONS
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  2. If an integer is chosen at random from the first two hundred, then pro...

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  3. 100 students appeared for two tests, 60 passed the first, 50 passed th...

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  4. Probability that a man will get tea is 2/3, and that he will not get c...

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  5. A bag contains 3 rd and 7bhlack balls. Two balls are selected at rando...

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  6. In a class of 125 students 70 passed in Mathematics, 55 in statisti...

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  7. The probability that a man will live 10 more years is 1//4 and the pro...

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  8. There are 4 envelopes corresponding to 4 letters. If the letters are p...

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  9. If A and B are mutually exclusive events in a sample space S, then

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  10. If A and B are two independent events such that P(overline(A))=(7)/(10...

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  11. If A and B are independent events such that P(A ) = 0.30 and P(B) = 0....

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  12. 7 white balls and 3 black balls are kept randomly in order. Find the p...

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  13. A fair coin is tossed repeatedly. If tail appears on first four tosses...

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  14. Five horses are in race. Mr. X selected two of horses at random and b...

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  15. Two dice are rolled once. Find the probability of getting such number...

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  16. If A and B are independent events such that P(Acap B) = 3/25 and P(A'c...

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  17. Out of 30 consecutive integers 2 are choosen at random. Find the proba...

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  18. Three integers are chosen at random from the first 20 integers. The...

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  19. A bag contains 16 coins of which two are counterfeit with heads on bot...

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  20. Conditional probability P(B//A) is defined only when a

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