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Question
A box contains 150 bulbs out of which 15 are defective. It is not possible to just look at a bulb and tell whether or not it is defective. One bulb is taken out at random from this box. Calculate the probability that the bulb taken out is a good one.
Solution
Total number of possible outcomes = 150
Out of 150 bulbs, 15 are defective
Number of bulbs which are good = 150 – 15 = 135
P(taking out a good bulb) =
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