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Three of the 30 balls are selected at random played with

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There are 30 tennis balls in a box, of which 18 are new and have never been used. Three of the 30 balls are selected at random, played with, and then returned to the box. Later, another three balls are drawn at random from the box. What is the probability that all of these three balls are new and have never been used.

Reference no: EM13639443

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