There are ten urns of which each of three contain 1 white and 8 black balls; each of other three contains 9 white and 1 black balls, and of the remaining four each contains 5 white and 5 black balls. One of the urns is selected at random and a ball taken blindly from it and it turns outto be white. What is the probability that an urn containing 1 white and 9 black balls was selected?

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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There are ten urns of which each of three contain 1 white and 8 black balls; each of other three contains 9 white and 1 black balls, and of the remaining four each contains 5 white and 5 black balls. One of the urns is selected at random and a ball taken blindly from it and it turns outto be white. What is the probability that an urn containing 1 white and 9 black balls was selected?

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