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| rev | Admin | (Created page with "'''Solution: B''' The present value is <math display = "block"> \begin{align*} v^3 + v^{10} + v^{17} + \cdots + v^{-4+7n}\\ = \frac{v^{3}-v^{3+7n}}{1-v^{7}}=\frac{\left(1-v^{3+7n}\right)-\left(1-v^{3}\right)}{1-v}=\frac{a_{\overline{3+7n}|}-a_{\overline{{{3}}}|}}{a_{\overline{{{7}}}|}}. \end{align*} </math> {{soacopyright | 2023 }}") | Nov 18'23 at 10:51 | +336 |