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Prob.Chap4.9 VERY URGENT

Three balls are to be randomly selected with replacement from an urn containing 20 balls numbered 1 through 20. If we bet that at least one of the drawn balls has a number as large as or larger than 17, what is the probability that we win the bet?

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There are 4 balls (numbered 17, 18, 19 , 20) having a number greater than or equal to 17. ...

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