一道GRE摸球的概率题three red marbles and 2 white marbles are placed
1个回答
答案是正确的.每次只抽一个,所以不要考虑白球,你的C(2,1)我不知道为什么要加进去.
第一个为红球概率,3/5,第二个,2/4,第三个1/3.独立事件概率相乘即可
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