有三个盒子.一个盒子里全是苹果,一个盒子里全是橘子,还有个盒子里面既有苹果也有橘子.这三个盒子上的标签都贴错了,无法从标签上判断盒子里具体装的什么.只打开一个盒子,而不看盒子里放的什么,你从其中拿出一个水果.通过看这个水果,你如何能够迅速正确地标明所有这三个盒子?
这个简单,我最近刚刚看过……等我想想呀……从标有混合盒子里拿一个水果,因为三个标签都贴错了,所以,这个盒子里只能是一种水果,苹果或橘子!如果是苹果,那标有苹果的盒子就是橘子（还是因为三个标签都是错的,这是最重要的已知条件!）标有橘子标签的盒子只能是混合水果!如果是橘子,同理可得,标有橘子的盒子里就是苹果,标有苹果的盒子就是混合水果!就是这么简单……
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