[概率]不透明袋子里有3个红球、3个白球,任意摸三个,2红1白、2白1红,3红、3白,概率各为多少?

2红1白=C3 2 ×C3 1 ÷C6 3 =9/20
2白1红=C3 1 ×C3 2 ÷C6 3 =9/20
3红=C3 3 ÷C6 3 =1/20
3白=C3 3 ÷C6 3 =1/20