Originally posted by PinkFloyd
I saw this puzzler on a rerun of "Special Unit 2" last week (gosh I miss that show). There were 2 female mutants: 1 always lied, the other always told the truth. The police guy couldn't figure out which was which, but his partner asked a question and said "she's the liar". She then explained how she deduced this, but she talked so fast I didn't catch it. Does anybody know the answer, or did the writers just make this whole puzzle up?
"If I asked the OTHER alien if she was a liar, would she say yes?"
The liar knows the other one would say no, so she says yes, because she's a liar.
The truth-teller knows the other one would say no, so she says no, because she tells the truth.