Answer
$\frac{5}{11}$
Work Step by Step
We know that $\sqrt (\frac{25}{121})=\frac{5}{11}$, because $(\frac{5}{11})^{2}=\frac{5}{11}\times\frac{5}{11}=\frac{5\times5}{11\times11}=\frac{25}{121}$.
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