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More ways to get Braingle...

Jacks and Aces

Logic puzzles require you to think. You will have to be logical in your reasoning.

 

Puzzle ID:#917
Fun:*** (2.68)
Difficulty:*** (2.51)
Category:Logic
Submitted By:slippy0101*
Corrected By:cowman12

 

 

 



A man has 3 cards face down on a table. One is a jack and two are aces. He knows the order but you do not. You can ask him one yes or no question, but when you do, you have to point to one of the cards. If you point to an ace, he will tell the truth, if you point to the jack, he will randomly say yes or no. You have to find one of the aces.


Hint

Yes, there is always a chance you will be pointing to the jack, and that the answer will be meaningless (just a random yes/no) but there is a way to work around it. Don't give up!
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Comments

Mike1313*
Sep 26, 2001

Ok, you didn't say they were in a line.
Mike1313*
Dec 03, 2001

Plus, I'd just pick one. I have a 66.67% chance of picking an ace, and thouse are pretty good odds.
cathalmccabe
May 29, 2002

SO Jack you would prefer 66.7% to 100% chance?
krishnanAin*
Oct 11, 2003

This is a really good one. I tried hard but couldn't get it.
SPUTNIK2Aus*
Feb 08, 2006

tricky! tricky!
MadDog72**
Mar 12, 2006

I was convinced there was no solution until I read the answer. Good one!
jntrcs*
Apr 08, 2006

that can't be right. that would mean there is always an ace to the right... what if the jack was there
TehIgnored*us*
Jun 22, 2006

if the jack was on the right, you must have been pointing to an Ace, which means he would tell the truth, and tell you that there is no Ace to the right of the card you are pointing to....choose the left card, it has to be an ace.
JasonD*
Aug 04, 2008

Kudos for originality, and double for stumping me!

My lame solution was to point at a card and ask, "Is my mother's mother's maiden name 'Thomas'?" If were pointing at a an ace, the man would balk, not knowing the answer, but a Jack would get me a 'yes' or 'no'.

Your solution is, of course, more proper and elegant.
farazahmad
Dec 14, 2012

Another question could be to ask "Does your middle card borders an Ace?" If the answer is yes, we know it is true and the middle card is an Ace. If the answer is no, the middle card is a Jack and other cards are Aces.



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