Answer
$n_{{C}{_{r}}}$ = $\frac{n!}{(n - r)!.r! }$
Work Step by Step
The number of possible combinations if r objects are taken from n items is $n_{{C}{_{r}}}$ = $\frac{n!}{(n - r)!.r! }$
College Algebra (6th Edition)
by Blitzer, Robert F.
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: 4
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