A telephone number consists of 10 digits: 3 digit area code followed by 7 digit number. How many different telephone numbers are possible if neither the first digit of the area code nor the first digit of the number itself can be 0?

A telephone number consists of 10 digits: 3 digit area code followed by 7 digit number. How many different telephone numbers are possible if neither the first digit of the area code nor the first digit of the number itself can be 0?

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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Expert Solution

Step 1

For area code , possible first digits are 1 to 9 and for the other number ,remaining digits are 0-9

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