(8) Given the universal set $I=\mathbf{N}$, let $A=\left\{x \mid x=3 n, \frac{n}{2} \in \mathbf{N}\right\}, B=\left\{y \mid y=m, \frac{24}{m} \in\right.$ $\mathbf{N}\}$, try to represent the sets $A \cap B$ and $\complement_{I} A \cap B$ using the listing method.
(8) $A \cap B=\{6,12,24\}, \complement_{1} A \cap B=\{1,2,3,4,8\}$