## Thinking Mathematically (6th Edition)

Published by Pearson

# Chapter 11 - Counting Methods and Probability Theory - 11.1 The Fundamental Counting Principle - Exercise Set 11.1: 17

144

#### Work Step by Step

The number of ways in which a series of successive things can occur is found by multiplying the number of ways in which each thing can occur. --------- Ways of choosing the 1st digit ... 8, 2nd digit ... 2, 3rd digit ... 9 Total codes possible (applying the Principle): $8\times 2\times 9=144$

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