How many different seven-digit phone numbers can be generated provided that the first digit cannot be zero? Explain what model you use to argue your case.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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How many different seven-digit phone numbers can be generated provided that the first digit
cannot be zero? Explain what model you use to argue your case.

Please use Multiplication Model 1 when explaining the answer. Keep combinatorial probability in mind. 

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