College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 8 - Sequences, Induction, and Probability - Concept and Vocabulary Check - Page 768: 5

Answer

r!

Work Step by Step

The formula for $n_{{C}{_{r}}}$ has same numerator as the formula for $n_{{P}{_{r}}}$ but contains an extra factor of r! in the denominator.
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