Xiaohong has 4 coats of different colors and 3 pairs of pants of different colors. How many matching methods are there in total?
小红有4件不同颜色的上衣，有3条不同颜色的裤子，共有多少种搭配方法．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>