一家人共有兄弟姐妹七人，但只知道甲、乙、丙、丁、戊、 己、庚七个人中如下情况: 1·甲有三个妹妹; 2·乙有一个哥哥; 3.丙是女的，她有两个妹妹; 4·丁有两个弟弟;5·戊有两个姐姐; 6，己也是女的，但她和庚没有妹妹。
请问，这七个人中谁是男性谁是女性?
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Subject: 也看看大家的逻辑推理----脑子不用会生锈的哦！
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