if the coin is silver , what is the probability that urn III was selected  answer is 2/3

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 3 urns containing coins. Urn I contains 7 gold coing , urn II contains 3 gold coins and 3 silver coins. and urn III contains 3 silver coins. an urn is selected and a coin is drawn from the urn. if the coin is silver , what is the probability that urn III was selected 

answer is 2/3

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