Tuesday, July 15, 2008

Lie Detector 1

Three people were having an argument. Tom says that Dick lies. Dick claims that Tom and Harry speak the same, only doesn't know whether truth or lie. So who is lying for sure?

1 comment:

Taposik said...

Tom says Dick lies. Therefore,
1)Tom is truthful implies Dick is a liar and
2)Tom is a liar implies Dick is truthful.

If Dick is truthful then Tom is a liar. Therefore according to Dick's statement Harry is also a liar.

If Dick is a liar then Tom is truthful. Therefore Harry must be a liar as Dick's statement is false.

Hence poor Harry without speaking a word has been condemned to death by some damn logicians.