Answer
$r^{\frac{1}{3}}s^{\frac{2}{3}}$
Work Step by Step
$\sqrt[6] (r^{2}s^{4})=r^{\frac{2}{6}}s^{\frac{4}{6}}=r^{\frac{2\div2}{6\div2}}s^{\frac{4\div2}{6\div2}}=r^{\frac{1}{3}}s^{\frac{2}{3}}$
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