Precalculus: Mathematics for Calculus, 7th Edition

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 887: 49

Answer

please see step-by-step

Work Step by Step

Rewriting $(1.01 )^{100} =(1+0.01)^{100}$, which , by the Binomial Theorem, expands into 101 terms, all of form $ \left(\begin{array}{l} n\\ r \end{array}\right)a^{r}b^{n-r}$, all positive, where the first three are $ \left(\begin{array}{l} 100\\ 0 \end{array}\right)1^{100}\cdot(0.01)^{0}=1\cdot 1\cdot 1=1$ $ \left(\begin{array}{l} 100\\ 1 \end{array}\right)1^{99}\cdot(0.01)^{1}=100\cdot 1\cdot 0.01=1$ $ \displaystyle \left(\begin{array}{l} 100\\ 2 \end{array}\right)1^{98}\cdot(0.01)^{2}=\frac{100\cdot 99}{2}\cdot 1\cdot 0.0001=0.495$ The sum of the first three terms in the expansion of $(1+0.01)^{100}$ is greater than 2, and since none of the remaining 98 terms is negative, it follows that the whole sum is greater than 2. $(1+0.01)^{100}= (1.01 )^{100} > 2$
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