Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 4 - Probability - 4-6 Counting - Beyond the Basics - Page 184: 40



Work Step by Step

If 9 letters are in the correct envelope, then the 10th letter must be in the correct envelope too (because all the incorrext places are occupied by the good ones being in them), therefore the probability of 9 letters being in the correct envelope is extremely close to 0.
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