Answer
$a^5b$
Work Step by Step
$a^5b^3=\underline{a^5}\times \underline b\times b\times b$
$a^5b^2=\underline{a^5}\times \underline b\times b$
$a^5b=\underline{a^5}\times \underline b$
$GCF=\underline{a^5}\times \underline b=a^5b$
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