方法,
讓後50報前50帽子的顏色 (或是讓奇數報偶數帽子的顏色,一個道理),後50就靠1/2的概率了。
方法,
讓後50報前50帽子的顏色 (或是讓奇數報偶數帽子的顏色,一個道理),後50就靠1/2的概率了。
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