?3个球随机的放到4个杯子里,杯子里最大数为1的概率?

问题描述:

?3个球随机的放到4个杯子里,杯子里最大数为1的概率?

任意放球的方法有类64种3000(1种),2100(3种),2010(3种),2001(3种),1200(3种),1110(6种),1101(6种),1020(3种),1011(6种),1002(3种),0300(1种),0210(3种),0201(3种),0120(3种),0111(6种),0102(3种),0030(1种),0021(3种...