10. A lot of 25 bulbs contains 5 defective bulbs. One bulb is drawn at random from the lot.
What is the probability that this bulb is defective?
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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Answer:
it contain bulb 20
dozen 20
and 40
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