A lady and a gentleman are sister and brother.We do not know

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A lady and a gentleman are sister and brother.We do not know who is older.Someone asked them:
Who is older?
The sister said:I am older.
The brother said:I am younger.
At least one of them was lying.Who is older?

一男一女为姐弟（兄妹）.我们不知道他们谁大些.有人问他们：
谁大些?
女的说：我大些.
男的说：我小些.
他俩至少有一个是在说谎,那谁大些呢?
根据逻辑,肯定是男的是哥哥（老大）,因为至少有一个在撒谎,如果俩人中只有一个撒谎的,则他俩都在撒谎,；如果有一个说的是真的,则都说的是真的.既然是至少一个撒谎,则两个都撒谎了.
希望有所帮助,如果认同,

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