Choose a pair of table tennis mixed doubles players from 3 boys and 4 girls. How many different team plans are there?
从3名男生和4名女生中选出一对乒乓球混合双打选手，有多少种不同的组队方案．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>