一道英文版的数学概率题!

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/12 05:32:27

一道英文版的数学概率题!
in a shipment of 30 televisions 4 are defective and 26 non-defective sets.two sets are selected at random from the shipment.
1.The probability that both sets will be defective is
2.The probability that one of the two sets will be defective is?
3.The probability that at least one of the two sets will be defective is
4.The probability that at most one of the two sets will be defective is?

在XX有30个XX.4个A,26个B.随机取2个~
1、2个都是A的概率.
P=4C2/30C2（计算器是按nCr按的吧~）
2、有1个是A的概率
P=4C1*26C1/30C2
3、至少1个是A
P=1-P(没有A)=1-26C2/30C2
4、至多有1个是A
P=P(1A)+P(0A)=4C1*26C1/30C2+26C2/30C2
—、—

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