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?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.8: Probabilities Of Disjoint And Overlapping Events
Problem 2C
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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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