Question a lot of 100 semiconducter chips contains 20 that, Ask an Expert

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Question: A lot of 100 semiconducter chips contains 20 that are defective. Two chips are selected at random, withouut replacement, from the lot.

a) what is the probability that the first one selected is defective?

b) what is the probability that the second one selected is defective given that the first one was defective?

c) what is probability that both are defective?

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