Symbol
Problem
A. Find the specified value of each of the following. Used the formula: $a_{x}$ = $\dfrac {5n\left(1-r\right)} {\left(1-r^{n}3}$ 1. $S_{5}=$ $\dfrac {93} {80},r=\dfrac {1} {2}:a_{x}=7$ 2. $S_{8}=2550_{,r}=2:a_{1}=7$ $3$ $S_{7}=7651_{,r}=3:$ $a_{1}=2$ $4.$ $S_{10}=51_{,150,r}=2:$ $a_{1}=7$ $5$ $S_{6}=126_{,r}=-\dfrac {1} {2}:a_{1}=7$ B. Find the sum of finite geometric sequence from the given values. $1.a_{1}=-2_{,r}=5_{,S_{3}}=7$ $2.a_{1}=3_{,r}=-3_{,S_{4}}=7$ $3.a_{1}=-3_{,r}=4_{,S_{6}}=7$ $4.a_{1}=-3_{,r}=-2_{,S_{6}}=2$ $-4+16-64+256..,S_{8}=7$