Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 9 - Counting and Probability - Exercise Set 9.4 - Page 564: 26

Answer

No, the first 6 months can have 3 birthdays and the last 6 can have 2.

Work Step by Step

As shown above, there exists a construction with 30 people spreading their birthdays across the year where no one month has 4 birthdays.
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