Answer
$24$
Work Step by Step
Using fundamental principle of counting, the number of variants is:
$$4\times 3\times 2=24$$
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 7 - Test - Page 701: 20
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