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表示 没明白案例是如何得出4 的。。。

Posted by yuhailin at 2010-07-22 11:30:37 on Problem 2723
表示 没明白案例是如何得出4 的。。。
开始选钥匙0的可以开 第1 2 两扇门啊。。、
再选 钥匙4的话 可以开第34两扇啊。。。
再选 钥匙2的话,可以开第6扇门啊。。。
不是5吗?怎么会是6的?

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