Ooh right <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> Answer to the "four people, two liars, two truthtellers" riddle:
->[color:"#324372"]Lets call our people A, B, C & D
T = always tells the truth
L = always lies
"Same" means both liars or both truthtellers.
"Different" means one is a liar and one tells the truth.
Ask D "IF A AND B ARE DIFFERENT, is A a truth-teller?"
--If D answers yes,
----Ask A "Are B and C the same?"
------If A answers yes
------A=T, B=L, C=L, D=T
------If A answers no
------A=L, B=T, C=T, D=L
--If D answers no,
----Ask A "Are B and D the same?"
------If A answers yes
------A=T, B=L, C=T, D=L
------If A answers no
------A=L, B=T, C=L, D=T
--If D doesn't answer, then it means that
--A and B are the same.
----Ask A "Are C & D the same?"
------If A answers yes,
------A=T, B=T, C=L, D=L
------If A answers no,
------A=L, B=L, C=T, D=T
Explanation: there are six different outcomes, you only get 2 questions. The questions can only be answered yes or no. There is no stipulation that anyone MUST answer a question.
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This is the simple solution. I'll save you the complex one <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
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