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A bag contains 20 discs numbered 1to 20....

A bag contains 20 discs numbered 1to 20. A disc is drawn from the bag. The probability that it bears a prime number is

A

`3/5`

B

`11/20`

C

`2/5`

D

`9/20`

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The correct Answer is:
C
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ICSE-PROBABILITY -MULTIPLE CHOICE QUESTION
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  2. An urn contains 9 red 7 white and 4 black balls. A ball is drawn at ra...

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  3. A bag contains 20 discs numbered 1to 20. A disc is drawn from the bag....

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  4. A coin is tossed twice. The probability of getting atleast one tail is

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  5. If the odds in favour of an eventare 2:1 then the probability of its o...

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  6. If the odds in favour of an event are 4:5, then the probability of non...

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  7. Let E1 and E2 are two mutually exclusive and exhaustive events. If od...

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  8. Events A and B are mutually exclusive exhaustive . If P(E1) =2/3 P(E2)...

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  9. If two dice are thrown together, then the probability that atleast one...

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  10. Two dice are thrown simultaneously. The probability that the sum of th...

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  11. A and B throw two dice each. If A gets a sum of 9 on his two dice, the...

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  12. In a single throw of three dice, the probability of getting the same n...

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  13. Two cards are drawn at random from a well shuffled pack of 52 cards. T...

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  14. Six boys and six girls sit in a row randomly. The probability that the...

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  15. Five boys and four girls sit in a row randomly. The probability that n...

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  16. If A and B are any two events P (A cup B) = 2/3 and P (barB) =1/2 , t...

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  17. If the probability of A to fail in an examination is 1/5 and that of B...

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  18. If A and B are mutually exclusive and exhaustive events and P(A) = 1/3...

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  19. If A, B, C are three mutually exclusive and exhaustive events of an ex...

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  20. In a large metropolitan area, the probabilities are 0.87, 0.36, 0.30 t...

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