Peter, David and Paul said following sentences: Peter: David is a liar, Pau

游客2024-08-12  11

问题 Peter, David and Paul said following sentences:
    Peter: David is a liar, Paul always tells the truth.
    David: Peter is truthful.
    Paul: David is a liar, Peter is truthful.
    Two of these men always tell the truth, one of them sometimes tells the truth and sometimes lies. Which of these men is a liar?

选项

答案 David.

解析 (Peter和Paul都认为David is a liar,三人中只有一个人有时会说谎,不可能两人同时说谎,所以David是说谎的人。)  
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