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A couple has two childen . Find the ...

A couple has two childen . Find the probability that both are boys ,if it is known that one of the children is a boy .

A

`1/9`

B

`1/3`

C

`2/3`

D

`4/5`

Text Solution

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The correct Answer is:
B
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ARIHANT SSC-PROBABILITY-INTRODUCTORY EXERCISE -(20.3)
  1. Three fair coins are tossed. Find the probability that they are all ta...

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  2. A coin is tossed twice and the four possible outcomes are assumed to b...

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  3. Consider a random experiment in which a coin is tossed and if the coin...

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  4. A die is rolled . If the outcome is an odd number what is the p...

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  5. A die is thrown twice and the sum of the numbers appearing is observed...

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  6. Two dice are thrown. Find the probability that the sum is 8 or greater...

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  7. A die is rolled. If the outcome is an odd number, what is the probabil...

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  8. In a class 45% students read English, 30% read French and 20% read bot...

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  9. In a class 45% students read English, 30% read French and 20% read bot...

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  10. A couple has two childen . Find the probability that both are bo...

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  11. A couple has two childen . find the probability that both are boys...

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  12. A bag contains 3 red and 4 black balls and another bag has 4...

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  13. A bag contains 3 red and 4 black balls and another bag has 4...

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  14. A bag contains 3 red and 4 black balls and another bag has 4...

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  15. A bag contains 3 red and 4 black balls and another bag has 4...

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  16. Two balls are drawn from an urn containing 2 white; 3 red and 4 black ...

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  17. A bag contains 6 red and 9 blue balls. Two successive drawing of four...

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  18. An urn contains 4 white 6 black and 8 red balls. If 3 balls are drawn ...

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  19. Two numbers are selected at random from integers 1 through 9. If th...

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  20. A box contains 25 tickets, numbered 1, 2, 3, .. 25. A ticket is drawn ...

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