3. Which number different from one replaces the triangle, which the square, and which the circle if:

$$
\begin{aligned}
& 12=\Delta \cdot \Delta \cdot \bigcirc \\
& 24=\Delta \cdot \bigcirc \cdot \square
\end{aligned}
$$
3. Since $2 \cdot 2 \cdot 3=12$, the triangle should be replaced with the number 2, and the circle with the number 3.