Answer
$10^9$
Work Step by Step
There are 10 different digits.
Each of the 9 digits in the sequence can be any of the 10 different digits.
Therefore there are $10^9$ Social Security Numbers.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 6 - Section 6.3 - Decision Algorithms: The Addition and Multiplication Principles - Exercises - Page 425: 40a
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