EXERCISE 9.1

EXERCISE 9.1 1. (a) $$ \begin{aligned} & 1, \frac{1}{3}, \frac{1}{9}, \frac{1}{27}, \ldots \\ \\ & a_{1}=1, \quad a_{2}=\frac{1}{3}, \quad a_{3}=\frac{1}{3^{2}}, a_{4}=\frac{1}{3^{3}}, \ldots \\ \\ & a_{1}=1, \quad a_{2}=\frac{1}{3^{2-1}}, \quad a_{3}=\frac{1}{3^{3-1}}, a_{4}=\frac{1}{3^{4-1}}, \ldots \\ \\ & \ldots \quad a_{n}=\frac{1}{3^{n-1}}, \ldots \end{aligned} $$ (b) $$ \begin{aligned} & 1, \quad-\frac{1}{3}, \frac{1}{9},-\frac{1}{27}, \cdots \\ \\ & a_{1}=(-1)^{1-1}, \quad a_{2}=(-1)^{2-1} … Read more