Suppose you are given a bag containing n unbiased coins. You are told that n − 1 of these coins are normal, with heads on one side and tails on the other, whereas one coin is a fake, with heads on both sides. Suppose you reach into the bag, pick out a coin at random, flip it, and get a head. What is the (conditional) probability that the coin you chose is the fake coin?

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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Suppose you are given a bag containing n unbiased coins. You are told that n − 1 of these coins are normal, with heads on one side and tails on the other, whereas one coin is a fake, with heads on both sides. Suppose you reach into the bag, pick out a coin at random, flip it, and get a head. What is the (conditional) probability that the coin you chose is the fake coin?
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