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Three electric lamps are fitted in a roo...

Three electric lamps are fitted in a room. 3 bulbs are chosen at random from 10 bulbs having 6 good bulbs. The probability that the room is lighted is

A

`(29)/(30)`

B

`(49)/(50)`

C

`(1)/(10)`

D

`(43)/(66)`

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The correct Answer is:
A
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AAKASH SERIES-PROBABILITY-Exercise-I
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  2. From first twenty natural numbers, 2 numbers are selected at random, t...

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  3. Three electric lamps are fitted in a room. 3 bulbs are chosen at rando...

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  4. A determinant is chosen at random from the set of all determinants of ...

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  5. In the above problem the probability of selecting a determinant having...

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  6. The probability that in a family of 4 children there will be atleast o...

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  7. There is a five volume dicitionary among 10 books arranged in a shelf ...

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  8. Two friends A and B have equal number of sons. There are 3 cinema tick...

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  9. A point is selected at random from the interior of a circle. The proba...

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  10. There are two circles in xy-plane whose equations are x^(2)+y^(2)-2y=0...

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  11. If A and B are two events such that P(A uu B)=0.65, P(A nnB)=0.15 then...

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  12. If 5 red roses and 5 white roses of different sizes are used in prepar...

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  13. There are eight different coloured balls and 8 bags having the same co...

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  14. P(AnnB)=(1)/(4), P(barA)=(1)/(3), P(B)=(1)/(2), then P(bar(AuuB))=

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  15. Suppose A and B are two events such that P(AnnB)=(3)/(25) and P(B-A)=(...

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  16. If P(AnnB)=(1)/(4), P(barAnnbarB)=(1)/(5) and P(A)=P(B)=P then the val...

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  17. A bag contains 5 black balls 4 white balls and 3 red balls. If a ball ...

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  18. The probabilities of two events A and B are 0.25 and 0.40 respectively...

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  19. A and B are mutually exclusive events with P(A) = (1)/(2)P(B) and A cu...

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  20. Only one of the two events A and B must occur. If P(A) = (2)/(3)P(B), ...

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