Snap, I missed that somehow.
i tried alot of direct question like that but its never right all the way, its solve 80% of the possibilities but not 100%
like now in the third possibilities you put (if m1 is T or R, m2 is L or R then m3 canot be R and has to be T or L)
but m3 can be the R, if m1 T and m2 L then m3 will be R
so in this case m3 can be R,T,L and we have one more question to go which make it impossible
Welcome to BrainDen.com - Brain Teasers Forum
|Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.
Of course, you can also enjoy our collection of amazing optical illusions and cool math games.
If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.
Thanks and enjoy the Den :-)
The liar, the truth teller....and the random answerer
Posted 24 September 2010 - 05:33 PM
Posted 25 September 2010 - 12:50 PM
Posted 18 October 2010 - 04:37 PM
Get the 3 person to stand in one straight line.
the 6 possible lineups are TLR TRL RLT RTL LTR LRT, where T = truthful guy, L = liar, R = random guy whose capable to lieing and telling the truth.
Qns are asked to determine the possible lineups in that group
Qns 1 ( to the 1st guy in the line) " is the L standing directly on the right side of R"
Yes : TLR RLT RTL LTR
No : TRL RLT RTL LRT
Qns 2 ( to the 2nd guy of the group who answered Yes) " is T in the group" *to the group who answered no, ask the qns to the 3rd guy instead. This should eliminate the possible groups down to two
Yes : RTL LTR
No : TLR RLT
Qns 3 ( to the 2nd guy of the group who answered Yes) "is the lineup as follow RTL)
Yes : RTL
No : LTR
Edited by swongy, 18 October 2010 - 04:42 PM.
Posted 15 November 2010 - 08:53 PM
Spoiler for Here's one simple answer:
This method works, but it's technically 4 questions (the London question asked three times, one for each guy) and the fourth to either the T or L to find the solution.
Posted 29 December 2010 - 11:30 PM
Test and see for your self!
Posted 27 September 2011 - 03:04 PM
So you go to the first one and ask him "if I were to ask you 'is the second person is the random guy', would you say yes?"
If the first person is the truth teller, then it is easy, he would say yes if the second person is the Random guy and no if not
If the second person is the liar and the second is the truth teller, then the liar would have said yes to 'is the second person is the random guy' but since he is still telling lies, he would say no.
If the second person is the liar and the second is the Random guy, then the liar would have said no to 'is the second person is the random guy' but since he is still telling lies, he would say yes.
So in both cases, the truth teller and the liar would clearly indicate if the second guy was the Random guy.
Now what if the Random guy was the first person?
He would say no if he was acting like a truth teller
and he would say no if he was acting like the liar
So after the first question you know if the second guy is the Random guy or not.
If he is not, then you ask the second one a similar question
"if I were to ask you 'is the third person is the random guy', would you say yes?"
For the same reasons as above, after this question you know for sure who the random guy is.
Now there is one more thing left, to find which one tell the truth and which one lies, and again, a similar question from the third person
"if I were to ask you 'is the first person is the truth teller', would you say yes?"
"if I were to ask you 'are you the truth teller', would you say yes?"
and you know which one is which. The whole key is to ask a question
As I said, the trick to this puzzle is to force the liar into a double negative situation, and remember that the random guy either tells the truth or lies which would mean that the follows the same thinking patters as the liar.
I hope that was clear
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users