Answer
81
Work Step by Step
There are 20 numbers are factors of 5 from 1 to 100, which means that there are 80 numbers that are not factors of 5. Therefore, you must pick 81 numbers from 1 to 100 to be sure you get one that’s divisible by 5.
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
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: 16
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