Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 10 - Section 10.1 - Sequences and Summation Notation - Exercise Set: 26



Work Step by Step

$\frac{20!}{2! 18!}$ Try to reduce the fraction before performing the multiplications. We can express 20! as 20! = 20*19*18!. We can divide both the numerator and the denominator by the common factor, 18!. $\frac{20!}{2! 18!}$ = $\frac{ 20*19*18!}{2*1*18!}$ = $\frac{20*19}{2}$= 190
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