College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 10 - Section 10.1 - Counting - 10.1 Assess Your Understanding: 25

Answer

9000

Work Step by Step

We can put 9 different digits in the first place (all digits, excluding zero). We can put 10 different digits in the second place (all digits). We can put 10 different digits in the third place (all digits). We can put 10 different digits in the fourth place (all digits). The number of four-digit numbers is the variation of these four: $9\times 10\times 10\times 10=9000$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.