Xiaohong has two unused tops and three different pairs of trousers. If she wants to match one set, how many different combinations are there?
小红有两件不用的上衣和3条不同的裤子，如果要搭配一套，一共有多少种不同的搭配．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>