Answer
10000
Work Step by Step
Number of digits = 10 = n
Number of selected digits = 4 = r
$\therefore$ number of permutations for password = $n^r$ = $10^4$ = $10000$
Invitation to Computer Science 8th Edition
by Gersting, Judith L.; Schneider, G. Michael
Published by
Cengage Learning
ISBN 10:
1337561916
ISBN 13:
978-1-33756-191-4
Chapter 8 - Exercises - Page 427: 4a
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