Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 6 - Section 6.2 - The Pigeonhole Principle - Exercises - Page 406: 34

Answer

At least nine people have the same number of hairs on their heads.

Work Step by Step

There are 8,008,278 people in New York City Number of hairs on people's head is less than 1,000,000 By generalised pigeonhole principle [$\frac{8,008,278}{1,000,000}$] = 9 people with same number of hairs on head.
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