5
$\begingroup$

There are two identical twin brothers.

  • The first one is honest, but he lies in his schizophrenic situations.
  • The second one is well-known liar, but he tells the truth when he gets one of his pathologic seizures .

What kind of yes-no questions should you ask anyone of them to detect whether he is in his normal or in his irregular state?

$\endgroup$
1
  • 5
    $\begingroup$ There is a simpler way to determine if they tell the truth. $\endgroup$
    – KSmarts
    Commented Feb 17, 2015 at 22:25

1 Answer 1

5
$\begingroup$

do you always speak the truth when you are crazy?

"yes" indicates that they are currently crazy


I just realised that the opposite also works and might be simpler

do you lie on purpose?

"yes" indicates that they are currently crazy

$\endgroup$
6
  • $\begingroup$ there is a simpler and shorter question :D $\endgroup$
    – Abr001am
    Commented Feb 17, 2015 at 21:56
  • $\begingroup$ I edited it, it's the same question but simpler. dunno how to make it more simple. $\endgroup$ Commented Feb 17, 2015 at 22:21
  • $\begingroup$ you can ... "are you in your pathologic situation ?" $\endgroup$
    – Abr001am
    Commented Feb 17, 2015 at 22:23
  • $\begingroup$ but this answer is accepted thu $\endgroup$
    – Abr001am
    Commented Feb 17, 2015 at 22:23
  • 1
    $\begingroup$ @Abidare001 "are you in your pathological situation" would always be answered no by the honest twin and yes by the liar. It's a useful question, but not what is asked for here. $\endgroup$
    – Callidus
    Commented Feb 19, 2015 at 1:36

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.