Answer
$3$
Work Step by Step
Using $a^{-x}=\dfrac{1}{a^x}$ or $\dfrac{1}{a^{-x}}=a^x$ and the laws of exponents, the given expression, $
\dfrac{1}{3^{-1}}
,$ is equivalent to
\begin{array}{l}\require{cancel}
3^1
\\\\=
3
.\end{array}
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