How many three-letter sequences are possible that use the letters a, p, j, e, z at most once each?

College Accounting (Book Only): A Career Approach
13th Edition
ISBN:9781337280570
Author:Scott, Cathy J.
Publisher:Scott, Cathy J.
Chapter8: Employer Taxes, Payments, And Reports
Section: Chapter Questions
Problem 5DQ
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How many three-letter sequences are possible that use the letters a, p, j, e, z at most once each?
 ----------------------------------sequences
Expert Solution
Step 1

There are 5 choices for the first letter

4 choices for the second letter (since one letter has already been used)

3 choices for the third letter (since two letters have already been used)

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