Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 11 - Sequences; Induction; the Binomial Theorem - Section 11.3 Geometric Sequences; Geometric Series - 11.3 Assess Your Understanding - Page 846: 98

Answer

$20$

Work Step by Step

We will consider the theorem of convergence of an Infinite Geometric Series in order to solve this probelm. The infinite geometric series $\displaystyle \sum_{k=1}^{\infty}a_{1}r^{k-1}$ converges when $|r| \lt 1,$and then its sum can be calculated as: $\displaystyle \sum_{k=1}^{\infty}a_{1}r^{k-1}=\frac{a_{1}}{1-r}=S_\infty$ where r is the common ratio. Since $r=0.95 \lt 1$, this shows that the infinite geometric series converges. Its sum will be : $S_\infty=\dfrac{a_{1}}{1-r}=\displaystyle \frac{1}{1-0.95}=20$
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