An urn contains 4 red marbles and 8 black marbles. A marble is drawn from the urn and a marble of the other color is then put into the urn. A second marble is drawn from the urn. Find the probability that the 2nd marble is 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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An urn contains 4 red marbles and 8 black marbles. A marble is drawn from the urn and a marble of the other color is then put into the urn. A second marble is drawn from the urn. Find the probability that the 2nd marble is red
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