Answer
$-6a^2b^3$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(-2ab)(-ab)(-3b)
,$ simplifies to
\begin{array}{l}\require{cancel}
(-2)(-1)(-3)a^{1+1}b^{1+1+1}
\\\\=
-6a^2b^3
.\end{array}
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