Huihui has 2 different tops and 3 different trousers, how many ways to match them together?
慧慧有2件不同的上衣和3条不同的裤子，穿一身共有多少种搭配方法．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>