Answer
15
Work Step by Step
$ \binom {6}4=\dfrac {6!}{4!\left( 6-4\right) !}=\dfrac {4!\times 5\times 6}{4!\times 2!}=\dfrac {5\times 6}{2!}=\dfrac {30}{2}=15 $
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 12 - Section 12.6 - The Binomial Theorem - 12.6 Exercises - Page 886: 17
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