Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 12 - Sequences; Induction; the Binomial Theorem - 12.1 Sequences - 12.1 Assess Your Understanding - Page 807: 20

Answer

$d_1=1$ $d_2=-\frac{2}{3}$ $d_3=\frac{3}{5}$ $d_4=-\frac{4}{7}$ $d_5=\frac{5}{9}$

Work Step by Step

If $\{d_n\}=\left\{(-1)^{n+1}\frac{n}{2n-1}\right\}$ then $d_1=(-1)^{1+1}\frac{1}{2(1)-1}=(1)(1)=1$ $d_2=(-1)^{2+1}\frac{2}{2(2)-1}=(-1)\frac{2}{3}=-\frac{2}{3}$ $d_3=(-1)^{3+1}\frac{3}{2(3)-1}=(1)\frac{3}{5}=\frac{3}{5}$ $d_4=(-1)^{4+1}\frac{4}{2(4)-1}=(-1)\frac{4}{7}=-\frac{4}{7}$ $d_5=(-1)^{5+1}\frac{5}{2(5)-1}=(1)\frac{5}{9}=\frac{5}{9}$
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