is it correct?

来源: mikelu 于 2009-06-17 17:12:21 [] [旧帖] [给我悄悄话] 阅读数 : (175 bytes)
本帖于 2009-07-08 17:48:21 时间, 由普通用户 康MM 编辑
回答: 常数... 由 laborday 于 2009-06-16 09:14:12

use 4 people as an example, X, A, B, C

X is the one who does not know his seat, and first get on,

Then, the probability of B and C wrong is at least 1/2.

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