Xiao Ming wants to participate in the competition, and now he has 3 jackets and 4 pairs of trousers, how many matching schemes does he have?
小明要参加比赛，现在有3件上衣与4条裤子，他有多少种搭配方案．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>