Answer
$ \frac{1}{a^{23}}$
Work Step by Step
$\frac{a^{-6}(a^{-8})}{a^{-2}(a^{11})}=\frac{a^{-6-8}}{a^{-2+11}}=\frac{a^{-14}}{a^9}=\frac{1}{a^{9+14}}=\frac{1}{a^{23}}$
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