Freeflows

Geometric Sequence Term 6

Two geometric sequences $ a_1, a_2, a_3, \ldots $ and $ b_1, b_2, b_3, \ldots $ have the same common ratio, with $ a_1 = 27 $, $ b_1=99 $, and $ a_{15}=b_{11} $. Find $ a_9 $.

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-
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9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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