Answer
$10000$
Work Step by Step
We have $4$ free digits and all of them have $10$ possibilities, thus in total we have $10^4=10000$ possibilities.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - Review Exercises - Page 842: 87
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