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49張. 假設52張牌裏面有4張是二.逆向思維,把4張二拿出來,剩下的48張牌裏面怎麼摸都無法保證有二,為保證一定能摸到二,必須摸完48張牌再摸一張二,故,至少要摸出49張牌才能保證其中至少有一張是二
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