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Question -

(i) A lot of 20bulbs contain 4 defective ones. One bulb is drawn at random from the lot. Whatis the probability that this bulb is defective?



Answer -

(ii) Suppose the bulb drawn in (i) is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

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