Of three persons A, B and C, one always lies while the other two always speak the truth.

  • C asked A: "Do you always speak the truth, yes or no?"
  • A said something that C could not understand.
  • So C asked B: "What did A just say?"
  • B replied: "A said NO."

So, who is the liar?


1 Answer 1


The answer is:

B is the liar.

The reason:

If A is a truth-teller, he has correctly answered YES (I am a truth-teller).
If A is a liar, he also has answered YES (lying, as he is a liar).

So A must have said YES, and B must be lying when he claims that A said NO.


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