Choose 3 friends from 4 friends Xiaohua, Xiaoling, Xiaoli and Xiaoqiang to participate in the school's knowledge competition. How many options are there?
在小华、小玲、小丽和小强4个朋友中推选3人参加学校的知识竞赛，推选的方案有多少种．
<gadget id="calculator">2 / 3 / 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 * 3 * (1/3)</gadget>
<output>4</output>

<result>4</result>