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A bag contains 5 white and 7 black balls...

A bag contains 5 white and 7 black balls and a man draws 4 balls at random. The odds against these being all black is

A

`7:92`

B

`92:7`

C

`92:99`

D

`99:92`

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The correct Answer is:
B
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DISHA PUBLICATION-PROBABILITY-PRACTICE EXERCISE (STANDARD LEVEL)
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  3. A bag contains 5 white and 7 black balls and a man draws 4 balls at ra...

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  9. There are 5 pairs of shoes in a cupboard from which 4 shoes are picked...

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  10. A dice is rolled three times, find the probability of getting a larger...

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  11. Two fair dice are thrown. The probability that the number appear are n...

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  12. Two dice are thrown simultaneously. What is the probability of obtaini...

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  13. Two dice are thrown at a time, find the probability that the sums of t...

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  14. If four whole numbers taken art random are multiplied together, the...

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  15. One card is drawn from a well-shuffled pack of 52 cards. What is the p...

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  16. A dice is thrown twice. The probability of getting 4, 5 or 6 in the fi...

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  17. Ram and Shyam appear for an interview for two vacancies in an organisa...

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  18. Three groups of children contain respectively 3 girls and 1 boy, 2 gir...

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  19. A class consists of 80 students, 25 of them are girls and 55 are boys....

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  20. If the probability for A to fail in an examination is 0.2 and that for...

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