Answer
$$40$$
Work Step by Step
\begin{align*}
\int_{1}^{3} \int_{0}^{2} x^{3} y d y d x&= \int_{1}^{3} \frac{1}{2}x^{3} y^2\bigg|_{0}^{2} d x\\
&= \frac{1}{2}x^{4} \bigg|_{1}^{3} \\
&= 40
\end{align*}
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