Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0321911210
ISBN 13: 978-0-32191-121-6

Chapter 3 - Probability - Section 3.1 Basic Concepts of Probability and Counting - Exercises - Page 141: 27

Answer

There are 4500 different codes.

Work Step by Step

First digit: 9 choices (cannot be zero). Second digit: 10 choices. Third digit: 10 choices. Fourth digit: 5 choices (must be even). Total: $9\times10\times10\times5=4500$ different codes.
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