Answer
$18a^{3}b^{6}$
Work Step by Step
Step 1: $(-6a^{2}b^{3})(-3ab^{3})$
Step 2: $-6\times-3\times a^{2}\times a\times b^{3}\times b^{3}$
Step 3: $18\times a^{2+1}\times b^{3+3}$
Step 4: $18a^{3}b^{6}$
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