2. 外语
  3. A typist types four envelopes and four letters. She places the letters in the envelopes at random. What are the chances that onl

A typist types four envelopes and four letters. She places the letters in the envelopes at random. What are the chances that onl

admin2013-02-03  72
问题 A typist types four envelopes and four letters. She places the letters in the envelopes at random. What are the chances that only three letters are in their correct envelopes?
选项
答案zero
解析 (如果三个都装对了，那么第四个也一定装对了，所以没有这种几率。)  
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本试题收录于： B类竞赛（英语专业本科专科）题库大学生英语竞赛（NECCS）分类
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B类竞赛（英语专业本科专科）

大学生英语竞赛（NECCS）

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