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A typist types four envelopes and four letters. She places the letters in the en
A typist types four envelopes and four letters. She places the letters in the en
游客
2024-08-12
53
管理
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?
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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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