Question

一道英文版的数学概率题！！！急！！！

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?

Answer 1

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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Answer 2

翻译？
在一批有30台电视机的货物中，4台式有瑕疵的，26台式没有瑕疵的。随机抽取2 台

1. 两台都有瑕疵的概率是多少？
2. 两台中有一台有瑕疵的概率是多少？
3. 两台中至少有一台有瑕疵的概率是多少？
4. 两台中最多两台都是有瑕疵的概率是多少？

追问

不是翻译 是解答。不过谢谢你的翻译