Answer
$3x^{4n}y^{n-1}$
Work Step by Step
RECALL:
$a^m \cdot a^n = a^{m+n}$
Multiply the coefficients together then use the rule above to the variables to obtain:
$=\frac{9}{3}x^{3n+n}y^{n-3+2}
\\=3x^{4n}y^{n-1}$
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