Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Theory and the Real Number System - 5.7 Arithmetic and Geometric Sequences - Exercise Set 5.7 - Page 332: 151

Answer

The provided statement is false and if\[\frac{{{d}_{n+1}}}{r}={{d}_{n}}\], the common difference of the two adjacent terms will be equal.

Work Step by Step

It is known that the geometric sequence is; \[a,ar,a{{r}^{2}},a{{r}^{3}},a{{r}^{4}},\ldots \] Where a is first term and r is common ratio. \[\begin{align} & r=\frac{{{a}_{2}}}{{{a}_{1}}} \\ & =\frac{{{a}_{3}}}{{{a}_{2}}} \\ & =\frac{{{a}_{3}}}{{{a}_{4}}} \end{align}\] Now, find the difference of two adjacent terms in G.P. \[\begin{align} & {{d}_{1}}=ar-a \\ & =a\left( r-1 \right) \end{align}\] And, \[\begin{align} & {{d}_{2}}=a{{r}^{2}}-ar \\ & =ar\left( r-1 \right) \end{align}\] So, \[{{d}_{1}}\ne {{d}_{2}}\]. Hence, the common difference of two adjacent terms is not equal. If\[\frac{{{d}_{n+1}}}{r}={{d}_{n}}\], the common difference of the two adjacent terms will be equal. Hence, the provided statement is false.
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