A study group has 3 male students and 4 female students, and now 2 group leaders need to be elected. If everyone has the same chance of being selected, how many possibilities are there for the selected group leader to be a man and a woman?
一个学习小组有3名男同学，4名女同学，现在要选出小组长2人．如果每人被选的机会是一样的，那么选出的小组长是一男一女的有多少种可能．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>