Answer
a) 10
b) 20
Work Step by Step
a) Subsets are calculated using combinations, so the number of combinations is $5C2 = 10$.
b) "words" are calculated using permutations, so the number of permutations is $5P2 = 20$.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 9, Counting and Probability - Chapter 9 Review - Exercises - Page 683: 3
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