Answer
$\frac{1}{a^{n}}$
Work Step by Step
Given : $\frac{a^{0}}{a^{n}}$
This becomes : $a^{0-n}$ , since $\frac{a^{m}}{a^{n}}=$ $a^{m-n}$
Thus, the answer is : $a^{-n}=$ $\frac{1}{a^{n}}$
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