Answer
$64,000$ different lock combinations.
Work Step by Step
There are 40 choices for each of the 3 numbers.
Using the Fundamental Counting Principle:
$40\times40\times40=64,000$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.6 - Counting Principles - 11.6 Exercises - Page 823: 25
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