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Q.

Three electric lamps are fitted in a room.  3 bulbs are chosen at random from 12 bulbs having 10 good bulbs. The probability that the room is lighted is

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a

0

b

1

c

112C3

d

1−10C312C3

answer is B.

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Detailed Solution

PE=1−Probability for room is not lighted        =1− probability of all the three bulbs are defective        =1-0=1
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