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问题:In a set of 20 books,two books are defective, and the remaining eighteen are good, a publisher randomlyselects four of the 20 books with replacement and classifies each as defectives or good. determine the number of possible outcomes for this experiment?
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In a set of 20 books,two books are defective, and the remaining eighteen are good, a publisher randomlyselects four of the 20 books with replacement and classifies each as defectives or good. determine the number of possible outcomes for this experiment?

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