Mathematics, 12.07.2019 11:00 hailscooper7363
Find a1 (first term) for the given geometric series sn=44405 r=3.4 n=7
Answers: 1
![\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}\\[-0.5em] \hrulefill\\ n=7\\ S_7=44405\\ r=3.4 \end{cases} \\\\[-0.35em] ~\dotfill](/tpl/images/0080/6922/afef6.png)
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Find a1 (first term) for the given geometric series sn=44405 r=3.4 n=7...
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