A bag contains 12 balls, of which 5 are red (R) and 7 are blue (B). The balls are indistinguishable apart from color. We are interested in choosing 2 balls from the bag, one at a time. A ball is chosen at random from the bag, it is replaced and a second ball is chosen. (a) If the first ball is red, what is the probability that the second is also red? (b) If the first ball is not red, what is the probability that the second is also not red?"

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A bag contains 12 balls, of which 5 are red (R) and 7 are blue (B). The balls are indistinguishable apart from color. We are interested in choosing 2 balls from the bag, one at a time. A ball is chosen at random from the bag, it is replaced and a second ball is chosen. (a) If the first ball is red, what is the probability that the second is also red? (b) If the first ball is not red, what is the probability that the second is also not red?"

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