Answer
$a^{3}b^{10}$
Work Step by Step
Step 1: $a\times b^{3}\times a^{2}\times b^{7}$
Step 2: $a\times a^{2}\times b^{3}\times b^{7}$
Step 3: $a^{1+2}\times b^{3+7}$
Step 4: $a^{3}\times b^{10}$
Step 5: $a^{3}b^{10}$
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