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题目内容双击单词支持查询和收藏哦～
Of the 20 lightbulbs in a box, 2 are defective. An inspector will select 2 lightbulbs simultaneously and at random from the box. What is the probability that neither of the lightbulbs selected will be defective?
Give your answer as a fraction.
153 /190显示答案
· 相关考点
6.4.1 古典概率
6.4.1 古典概率
以上解析由 考满分老师提供。
