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7. In a box of 20 parts, four of the parts are defective. Two parts are selected at random with replacement. Page 7 of 9

7. In a box of 20 parts, four of the parts are defective. Two parts are selected at random with replacement. Page 7 of 9 A. Find the probability that both parts are defective. B. Find the probability that both parts are not defective

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