If Alice and Alan (a couple) and Barbara and Bob (another couple) and Christine and Charlie (another couple) sit in a circle of chairs, what is the probability that each of the 3 couples sit together?
If Alice and Alan (a couple) and Barbara and Bob (another couple) and Christine and Charlie (another couple) sit in a circle of chairs, what is the probability that each of the 3 couples sit together?
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Related Book For 
Introduction to Probability
1st edition
Authors: Mark Daniel Ward, Ellen Gundlach
ISBN: 978-0716771098