New here

Anything goes, but keep it seemly...

New here

Postby Laura » Wed Feb 20, 2013 12:23 am

Hi, I'm Laura and I like sudoku.
I like all kinds of brain teasers
and logic puzzles. Anyone here into
3-D puzzles?
Laura
 
Posts: 1
Joined: 20 February 2013

Re: New here

Postby Smythe Dakota » Sun Feb 24, 2013 11:15 am

I'm not really into 3-D, except to observe that 3-D tic-tac-toe, unlike 2-D, is a forced win for the first player.

Here's one you've probably already heard:

You are in a room with two doors. One door leads to freedom. The other door leads to a lion who will immediately eat you as soon as you open the door. You don't know which door is which. There are two guards in the room. One of them always tells the truth. The other always lies. You don't know which is which. You are allowed to ask one question of one of the guards. What question should you ask, so that you will know which door you should open?

Bill Smythe
Smythe Dakota
 
Posts: 521
Joined: 11 February 2006

Re: New here

Postby tarek » Mon Feb 25, 2013 1:18 pm

You'll love 'The Curse'

This is a riddle from their Valentine special:

Roses are red
Violets are blue
Add a daffodil
And answer this clue
User avatar
tarek
 
Posts: 2574
Joined: 05 January 2006

Re: New here

Postby daj95376 » Mon Feb 25, 2013 4:52 pm

Assuming that both guards know what's behind both doors, and that each guard knows the false/true nature of the other guard.

Question: Which door would the other guard recommend that I enter?

You then enter the door not in the reply!
daj95376
2014 Supporter
 
Posts: 2624
Joined: 15 May 2006

Re: New here

Postby 7b53 » Wed Feb 27, 2013 3:04 am

hehe.....beside knowing which door is safe, you should also know which guard is a liar.
the new question is.....
Last edited by 7b53 on Wed Feb 27, 2013 1:19 pm, edited 1 time in total.
7b53
2012 Supporter
 
Posts: 156
Joined: 01 January 2012
Location: New York

Re: New here

Postby Smythe Dakota » Wed Feb 27, 2013 10:45 am

I doubt very much whether you could find a single question asked of one guard that would tell you both which door is safe and which guard is lying.

Bill Smythe
Smythe Dakota
 
Posts: 521
Joined: 11 February 2006

Re: New here

Postby 7b53 » Fri Mar 01, 2013 1:30 pm

Bill,
I don't even have an answer. but pretty sure there is one, because I clearly remember this problem.
since daj already posted half of the answer(question). we can just concentrate on the other part.
"what question will tell us which is the lying guard".
then try to combine it with daj's answer to figure out the new question.
7b53
2012 Supporter
 
Posts: 156
Joined: 01 January 2012
Location: New York

Re: New here

Postby Smythe Dakota » Sun Mar 03, 2013 6:30 am

Well, of course you could always ask, "which guard would the other guard say is the liar?" and either guard would point toward the truth-telling guard. This is similar to the original answer. But I still don't see how you could combine both into one question, without making it a compound question, which in essence would be two questions.

Bill Smythe
Smythe Dakota
 
Posts: 521
Joined: 11 February 2006


Return to Coffee bar