Finite Math and Applied Calculus (6th Edition)

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: 39a

Answer

$8,000,000$

Work Step by Step

There are 10 different digits, The first digit of a telephone number can be 8 different digits. (can't be 0 or 1) The other 6 digits of the number can be 10 different digits. This gives a total of $8*10^6=8,000,000$ different telephone numbers
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