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A batch of 50 CPU chips contains 10 that are defective

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A batch of 50 CPU chips contains 10 that are defective. Two chips are selected at random, without replacement.

(a) What is the probability that the first one selected is defective?

(b) What is the probability that the second one selected is defective?

(c) What is the probability that both are defective?

(d) How would the probability in (b) change if chips selected were replaced before the next selection?