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10% of the bulbs produced in a factory are of red colour and 2% are red and defective. If one bulb is picked up at random, determine the probability of its being defective if it is red.

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Let A and B be the events that the bulb is red and defective, respectively

Thus the probability of the picked up bulb of its being defective, if it is red, is \(\frac15\).

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