Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 4 - Probability and Counting Rules - 4-4 Counting Rules - Exercises 4-4 - Page 235: 10

Answer

$1296$ and 360

Work Step by Step

How many 4-letter code words can be made using the letters in the word "pencil" if repetitions are permitted? There are 6 difference letters in the word"pencil", with repetition, the total number of code words is $6^4=1296$ If repetitions are not permitted? Without repetition, use permutation, $_6P_4$=360
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