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A woman goes to visit the house of some ...

A woman goes to visit the house of some friend whom she has not seen for many years. She knew that besides the two married adults in the household, there are two children of different ages. But she does not knew their genders. When she knocks on the door of the house, a boy answers. What is the probability that the younger child is a boy?

A

`2/3`

B

`1/2`

C

`1/3`

D

`1/4`

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The correct Answer is:
A
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DISHA PUBLICATION-PROBABILITY-PRACTICE EXERCISE (STANDARD LEVEL)
  1. Triangles are formed by joining vertices of an octagon. Any one of tho...

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  2. A bag contains 4 white and 2 black balls .Another contains 3 white and...

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  3. A woman goes to visit the house of some friend whom she has not seen f...

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  4. The odds against P solving a problem are 8 : 6 and odds in favour of Q...

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  5. The probability that A can solve a problem is 2//3 and B can solve it ...

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  6. Atul can hit a target 3 times in 6 shots, Bhola can hit the target 2 t...

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  7. Suppose six coins are tossed simultaneously. Then the probability of g...

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  8. Let A and B be two events such that P (bar(AuuB))=1/6, P(AnnB)=1/4and ...

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  9. Seven digits from the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 are written...

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  10. A committee of 5 Students is to be chosen from 6 boys and 4 girls. Fin...

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  11. There are 10 envelopes and 10 letters to go inside them. Each letter i...

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  12. A three digit number is written down by random choice of the digits 1 ...

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  13. 4 gentlemen and 4 ladies take seats at random round a table. The proba...

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  14. Two cards are drawn one by one from a pack of cards. The probability o...

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  15. Seven persons are to be seated in a row. The probability that two part...

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  16. The odds against A solving a certain problem are 3 to 2 and the odds i...

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  17. If two events A and B are such that P(A')=0.3, P(B)=0.4 and P(A nn B')...

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  18. If A and B are two events such that P(A) ne 0 and P(B) ne 1 then P(...

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  19. Let 0ltP (A)lt1, 0ltP(B) lt1and P(A uu B)=P(A)+P(B)-P(A)*P(B) then (A...

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  20. A group of researchers took a fair sample of 1972 children from the ge...

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