Answer
$\dfrac{1}{n^{15}}$
Work Step by Step
Using the laws of exponents, the given expression, $
(n^{-5})^3
$, is equivalent to
\begin{array}{l}
n^{-5(3)}
\\\\=
n^{-15}
\\\\=
\dfrac{1}{n^{15}}
.\end{array}
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