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In a pack of 10 watches, 3 are known ot ...

In a pack of 10 watches, 3 are known ot be defective. If 2 watches are selected at random from the pack, what is the probability that at least one is defective ?

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The correct Answer is:
`=(8)/(15)`
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CHHAYA PUBLICATION-PROBABILITY-SAMPLE QUESTIONS FOR COMPETITIVE EXAMS
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  2. If A and B are two independent events of a random experiment and P(A) ...

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  3. If A and B are two events and P(A)= (3)/(4), P(B) = (5)/(8), then -

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  4. If A and B are two mutually exclusive events, then-

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  5. A coin is tossed 2n times. The probability of getting head n times, is...

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  6. For two events A and B , the correct statement is/ are -

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  7. If A and B are two events such that P(AcupB) = (3)/(4), P(AcapB) =(1)/...

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  8. If A,B and C are three independent events such that P(B) = (3)/(2)P(A)...

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  9. An ubiased die is thrown, getting an even number is 3 times the probab...

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  10. A problem in mathematics is given to two students A and B. The probabi...

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  11. A fair coin is tossed 8 times, then the probability of getting 3H is (...

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  12. If the squares of a 8xx8 chessboard are painted either red or black at...

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  14. If the squares of a 8xx8 chessboard are painted either red or black at...

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  15. Probability that husband is telling the truth is 0.8, and the probabil...

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  16. Two dice are rolled.Let's r denotes the sum of the number appearing on...

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  17. Two dice are rolled the probability that the sum is neither 8 nor 9 is

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  18. Each of the following question contain two statements- Statemnet I and...

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  19. Each of the following question contain two statements- Statemnet I and...

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