Answer
$5ab^{10}$
Work Step by Step
$\sqrt (25a^{2}b^{20})=5ab^{10}$, because $(5ab^{10})^{2}=5ab^{10}\times 5ab^{10}=(5\times5)\times a^{1+1}\times b^{10+10}=25a^{2}b^{20}$
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