3. Suppose you have an urn containing 7 red and 3 blue balls. You draw three balls at random. On each draw, if the ball is red, you set it aside and if the ball is blue you put it back in the urn. What is the probability that the third draw is blue? (If you get a blue ball it counts as a draw even though you put it back in the urn).

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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3. Suppose you have an urn containing 7 red and 3 blue balls. You draw three balls
at random. On each draw, if the ball is red, you set it aside and if the ball is blue you
put it back in the urn. What is the probability that the third draw is blue? (If you get a
blue ball it counts as a draw even though you put it back in the urn).
Transcribed Image Text:3. Suppose you have an urn containing 7 red and 3 blue balls. You draw three balls at random. On each draw, if the ball is red, you set it aside and if the ball is blue you put it back in the urn. What is the probability that the third draw is blue? (If you get a blue ball it counts as a draw even though you put it back in the urn).
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