Question
Simplify: $\left(\frac{1}{3^{3}}\right)^{7}$

Answer

$\left(\frac{1}{3^{3}}\right)^{7}=\frac{1^{7}}{\left(3^{3}\right)^{7}}$$=\frac{1}{3^{21}}=3^{-21}$

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