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प्रश्न
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 defective one.
योग
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उत्तर
Total number of possible outcomes = 150
Number of bulbs which are defective = 15
P(taking out a defective bulb) = `15/150 = 1/10`
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