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A young couple has two children. The pro...

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

A

`(1)/(4)`

B

`(1)/(3)`

C

`(1)/(10)`

D

`(1)/(20)`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PROBABILITY-Exercise-I
  1. Two events A and B are such that P(A) = (1)/(2), P(A|B) = (1)/(4) and ...

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  2. Suppose E and F are two events of a random experiment. If the probabil...

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  3. A young couple has two children. The probability that both children ar...

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  4. A couple has 3 children and it is known that atleast one of them is a ...

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  5. Two dice are thrown at a time and the sum of the numbers on them is 6....

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  6. Two coins are tossed . The probability of getting 2 tails if it is kno...

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  7. When a die is rolled, the probability of getting an odd prime number i...

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  8. In a class 40% students study mathematics 25% study chemistry and 15% ...

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  9. Two integers are selected at random from integers 1 to 11. If the sum ...

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  10. The sum of two positive numbers is 10. The probability that their prod...

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  11. Five persons A,B,C,D,E are contesting an election in which 3 persons a...

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  12. P(AuuB)=5//6, P(AnnB)=1//3 and P(barB)=(1)/(2) then A and B are

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  13. One die and a coin are (both unbaised) tossed simultanuonly. The proba...

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  14. A coin and six faced die, both unbaised are thrown simultaneously . Th...

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  15. If P(A)=(1)/(2), P(B)=(1)/(5), A and B are independent events then P((...

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  16. A and B are two possible events of an experiment such that P(A)=0.3, P...

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  17. If the probability for A to fail in one exam is 0.2 and that for B is ...

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  18. The probability that a boy A will get a scholarship is 0.9 and that an...

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  19. If A and B are two independent events such that P(AnnB)=1//6 and P(Ann...

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  20. If A and B are two independent events of a random experiment such that...

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