Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 10 - Section 10.6 - Counting Principles, Permutations, and Combinations - Exercise Set - Page 1103: 19


This is a problem involving permutations.

Work Step by Step

Here, we get that four letter passwords can be formed from the letters A, B, C, D, E, F and G. The order in which the letters are chosen makes a difference because each of the letters (A, B, C, D, E, F and G) is different and no repetition is allowed. Order matters. Thus, this is a problem involving permutations.
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