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An urn contains 10 black and 5 white bal...

An urn contains 10 black and 5 white balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are black ?

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The correct Answer is:
`(3)/(7)`
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KUMAR PRAKASHAN-PROBABILITY-Textbook Illustrations for Practice Work
  1. A dice is thrown twice and the sum of the numbers appearing is observe...

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  2. Consider the experiment of tossing a coin. If the coin shows head, tos...

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  3. An urn contains 10 black and 5 white balls. Two balls are drawn from t...

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  4. Three cards are drawn successively, without replacement from a pack of...

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  5. A die is thrown. If E is the event the number appearing is a multiple ...

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  6. An unbiased die is thrown twice. Let the event A be 'odd number on the...

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  7. Three coins are tossed simultaneously. Consider the event E 'three hea...

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  8. Prove that if E and F are independent events, then so are the events ...

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  9. If A and B are two independent events, then the probability of occurre...

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  10. A person has undertaken a construction job. The probabilities are 0.65...

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  11. Bag I contains 3 red and 4 black balls while another Bag II contains 5...

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  12. Given three identical boxes I, II and III, each containing two coins. ...

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  13. Suppose that the reliability of a HIV test is specified as follows: ...

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  14. In a factory which manufactures bolts, machines A, B and C manufacture...

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  15. A doctor is to visit a patient. From the past experience, it is known ...

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  16. A man is known to speak truth 3 out of 4 times. He throws a die and r...

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  17. A person plays a game of tossing a coin thrice. For each head, he is ...

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  18. A bag contains 2 white and 1 red balls. One ball is drawn at random an...

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  19. Two cards are drawn successively with replacement from a well-shuffled...

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  20. Find the probability distribution of number of doublets in three throw...

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