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There are 15 tennis balls in a box, of which 9 have not
Chapter 3, Problem 29P(choose chapter or problem)
Problem 29P
There are 15 tennis balls in a box, of which 9 have not previously been used. Three of the balls are randomly chosen, played with, and then returned to the box. Later, another 3 balls are randomly chosen from the box. Find the probability that none of these balls has ever been used.
Questions & Answers
QUESTION:
Problem 29P
There are 15 tennis balls in a box, of which 9 have not previously been used. Three of the balls are randomly chosen, played with, and then returned to the box. Later, another 3 balls are randomly chosen from the box. Find the probability that none of these balls has ever been used.
ANSWER:
Step 1 of 3
Given that 15 tennis balls in a box, of which 9 have not previously been used.
When three balls are chosen either none, one, two or three may be are used balls.