9. Place 3 identical white balls, 4 identical red balls, and 5 identical yellow balls into three different boxes, allowing some boxes to contain balls of different colors. The total number of different ways to do this is (answer in numbers).

允许有的盒子中球的颜色不全的不同放法共有种 (要求用数字做答).
Allowing some boxes to contain balls of different colors, the total number of different ways to do this is (answer in numbers).
$\begin{array}{l}\text { 9. } 3150 \text {. } \\ \mathrm{C}_{5}^{2} \cdot \mathrm{C}_{6}^{2} \cdot \mathrm{C}_{7}^{2}=3150 \text {. }\end{array}$