Mathematics, 19.01.2020 20:31, sarahlearn3
Evaluate the summation of 2 times negative 2 to the n minus 1 power, from n equals 1 to 7..
Answers: 3
![\bf \qquad \qquad \textit{sum of a finite geometric sequence} \\\\ S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ r=\textit{common ratio} \end{cases} \\\\[-0.35em] \rule{34em}{0.25pt}](/tpl/images/0461/9840/8e990.png)
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Evaluate the summation of 2 times negative 2 to the n minus 1 power, from n equals 1 to 7.....
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