Timothy once visited a land of knights and liars,and met two inhabitants,A and B. He had the following conversation.

Timothy:A,is B a liar?
Timothy hears A's answer,but he will not tell you what it was.
Timothy:B,are you both liars?
Timothy hears B's answer,but he will not tell you what it was.
At this point,I will not tell you whether or not he knew what they were.

He once told his friend what questions he asked,but not what answers he got. The friend did not have enough information,so the following dialogue occurred.

Friend:Were your answers the same?
Timothy's friend hears his answer,and finally the friend has enough information to solve what A and B are.
What are they?

Question 1: A can answer Y or N
Question 2: B can only answer N
Question 3: Friend knows what each is after knowing whether they answered they same or differently.

Solutions: If they answered differently A:Y, B:N, then A:Knight, B:Liar
If they answered the same A:N, B:N, then they are both knights.

Posted by Hank on 2003-05-13 03:08:27