What is the probability that both are defective

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Reference no: EM131082961

a lot of 100 semiconductor chips contain 20 that are defective .two are selected randomly ,without 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?

Reference no: EM131082961

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