有一副正常的撲克牌，現在從中拿出二張鬼牌和一張紅心Ａ、一張黑桃Ｑ、一張方塊７。我們現在設定牌有黑桃、紅心、方塊、梅花、小丑的那面為正面，另一面為反面。現將這五張牌蓋在桌上，反面朝上。有三個人他們知道這五張牌內有什麼牌，但不知道位置順序。這三人從這五張牌中各抽出一張拿在手上，舉在胸前，反面朝自己，面向另外二人。三人都看得到對方拿了什麼牌，而看不到自己的。現在來了某路人甲，他問：「你們知道自己拿到什麼牌嗎？」三人互看了一下後都紛紛搖頭。那路人甲又問：「不知道沒關係，你們說說看自己手上的牌是不是鬼牌？」三人又互看許久，接著其中一人舉手道：「我知道了！我的不是鬼牌，而且是黑桃Ｑ！」那人自信滿滿，不可能是猜的，他是靠推理推出來的。請問，他是如何推理的？
解答(想要解密請聯絡作者)：
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