Answer
$6x^{3n}$
Work Step by Step
Using the law $a^{m}\times a^{n}=a^{m+n}$ to obtain:
$2x^{n}3x^{2n}$
$=(2\times 3)(x^{n}\times x^{2n})$
$=(6)(x^{n+2n})$
$=6x^{3n}$
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