(2007 National College Entrance Examination Questions) Select 4 students from 5 students to participate in public welfare activities on Friday, Saturday and Sunday, one day per person. It is required that 2 people participate on Friday, and 1 person participates on Saturday and Sunday, so there are different selection methods. how many kinds
(2007年全国高考题)从5位同学中选派4位同学在星期五、星期六、星期日参加公益活动，每人一天．要求星期五有2人参加，星期六、星期日各有1人参加，则不同的选派方法共有．多少种
<gadget id="calculator">5 * 6 * 2</gadget>
<output>60</output>

<result>60</result>