A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? Suppose the bulb drawn in previous case 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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The answer is super simple.
Number of bulbs = 20
Defective bulbs = 4
Probability = 4/20 - answer
Number of bulbs = 20
Defective bulbs = 4
Probability = 4/20 - answer
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