Algebra and Trigonometry 10th Edition

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: 24a

Answer

There are $9000$ possible four digit numbers.

Work Step by Step

First digit: 9 choices Second digit: 10 choices Third digit: 10 choices Fourth digit: 10 choices Using the Fundamental Counting Principle: $9\times10\times10\times10=9000$
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