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A locker can be opened by dialing a fixe...

A locker can be opened by dialing a fixed three digit code from 000 to 999. A stranger who does not know the code, tries to open the locker by dialing three digits at random. Probability, that he opens the locker in first trail, is

A

`1/1000`

B

`9/1000`

C

`99/100`

D

`99/1000`

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The correct Answer is:
A
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AAKASH INSTITUTE ENGLISH-PROBABILITY-ASSIGNMENT (SECTION - A Competition Level Questions)
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  4. Two numbers are selected randomly from the set S={1,2,3,4,5,6} without...

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

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  6. If E and F are independent events such that 0 lt P(E) lt 1 and 0 lt P(...

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  7. If A and B are two independent events such that P (A) =1//2, P(B)=1//5...

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  8. Let 0ltP(A)lt1, 0ltP(B)lt1 and P(AcupB)=P(A)+P(B)-P(A)P(B), then,

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  9. A coin is tossed three times in succession. If E is the event that the...

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  10. A dice is thrown three times and the sum of the thrown numbers in 15. ...

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  11. The dice are thrown. What is the probability that the sum of the numbe...

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  12. If A and B are two events such that P(A) = 3/8 , P(B) = 5/8 and P(A cu...

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  13. If 4P(A) = 6P(B) = 10P(AcapB)=1, then P(B/A)

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  14. Indian and four American men and their wives are to be seated randomly...

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  15. For a biased die the probabilities for different faces to turn up are ...

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  16. A and B are two events such that P(A)= 0.8, P(B) = 0.6 and P (Ann B) =...

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  17. One ticket is selected at ransom form 50 tickets numbered 00,01,02,…,4...

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  18. It is given that the events A and B are such that P(B) = 1/4, P(B|A) =...

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  19. If the events A and B are mutually exclusive, then P( A/B) =

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  20. Two aeroplanes I and II bomb a target in succession. The probabilitie...

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