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The contents of three urns are as follow...

The contents of three urns are as follows: Urn 1-7 white, 3 black balls.Urn 2 - 4 white, 6 black balls Urn 3 - 2 white and 8 black balls.One of these urns is chosen at random with probabilities 0.20, 0.60 and 0.20 respectively. From the chosen urn two balls are drawn at random without replacement. If both these balls are white, what is the probability that these came from urn 3 ?

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RD SHARMA ENGLISH-PROBABILITY-All Questions
  1. The contents of urn, I, II, III are as follows Urn I: 1 White, 2 black...

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  2. A bag A contains 2 white and 3 red balls and a bag B contains 4 white ...

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  3. The contents of three urns are as follows: Urn 1-7 white, 3 black ball...

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  4. Suppose a girl throws a die. If she gets a 5 or 6, she tosses a coi...

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  5. Two groups are competing for the positions of the board of Directors o...

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  6. Suppose 5 men out of 100 and 25 women out of 1000 are god orators. An ...

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  7. In a class, 5% of the boys and 10% of the girls have an IQ of more tha...

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  8. A factory has three machines X, Y, and Z producing 1000, 2000 and 3...

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  9. An insurance company insured 3000 scooters, 4000 cars and 5000 trucks....

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  10. Suppose we have four boxes A,B,C and D containing coloured marbles ...

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  11. A manufacturer has three machine operators A, B and C. The first op...

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  12. There are three coins. One is two headed coin (having head on both ...

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  13. In  a factory machine A produces 30% of the total output, machine B...

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  14. Three urns, A, B, and C contain 6 red and 4 white ; 2 red and 6 white;...

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  15. In a group of 400 people, 160 are smokers and non-vegetarian, 100 are ...

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  16. In a certain college, 4% of boys and 1% of girls are taller than 1....

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  17. An insurance company insured 2000 scooters and 3000 motorcycles. The ...

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  18. Of the students in a college, it is known that 60% reside in a hostel ...

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  19. There are three coins. One is two -heated coin (having head on both fa...

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  20. Assume that the chances of a patient having a heart attack is 40%. ...

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