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Thread: How clever are you?

  1. #1
    Senior Member kris-one's Avatar
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    How clever are you?

    Probably reason why i'm currently unemployed, I didn't get it 555



    Look at the four cards above. We know for a fact that each card has a letter on one side and a number on the other. Truthful Terry says: ‘Every card that has a D on one side has a 3 on the other.’ What is the fewest number of cards you need to turn over to find out whether Truthful Terry is actually telling the truth? And which ones?
    Will give answer in a bit...
    Last edited by kris-one; 22nd November 2015 at 23:58.




  2. #2
    Senior Member Waharoa's Avatar
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    Can't see the image Chris...

  3. #3
    Senior Member kris-one's Avatar
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    And don't cheat




  4. #4
    Senior Member Waharoa's Avatar
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    Turning the D over and no number 3... will mean he is wrong... but if it has a 3.... then need to find another number to see if a "D" on other side or not. So go to Number 3 and if a D... Terry is still right, unless he is a Liberal. So will then have to go to Number 7... to check if has a D.... so can possibly work in 2 cards (If you check Number 7 first and it has a D on it (remote chance?)), so has to be 3 cards to be sure?

  5. #5
    Senior Member briofoz's Avatar
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    ooooonnnnneeeee

    D

  6. #6
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    Quote Originally Posted by Waharoa View Post
    So go to Number 3 and if a D... Terry is still right, unless he is a Liberal.
    But Terry didn't say that only cards with a D has a 3 on the other side. Thus even if the 3 has a G on the other side, he could still be telling the truth. Liberal or not.

    Edit: Forgot to give my take. I agree with briofoz, one. You have to turn over D. The rest of the cards doesn't matter, they cannot tell if he is lying or not.
    Last edited by Greatdane; 23rd November 2015 at 01:32.

  7. #7
    Senior Member kris-one's Avatar
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    Feels great that I'm in such good company being a dumbo 555




  8. #8
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    you need D and 7. However, it does not specify if the four cards are the only ones in existence and therefore I think "none" is a good answer as well as you cannot tell if he is lying if there are more than the 4 cards shown.
    Waharoa likes this.

  9. #9
    Senior Member slampay's Avatar
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    Terry is a cunt
    Last edited by slampay; 23rd November 2015 at 01:51.
    Waharoa, tnlawyer, dawsey and 4 others like this.
    A woman won The Nobel Peace Prize? Must have been a pretty good sandwich.

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    Quote Originally Posted by kuhio View Post
    you need D and 7.
    You are right, blunder from me.

    (enjoy it, I will not say that many times to you 555)

  11. #11
    Senior Member Waharoa's Avatar
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    Quote Originally Posted by Greatdane View Post
    But Terry didn't say that only cards with a D has a 3 on the other side. Thus even if the 3 has a G on the other side, he could still be telling the truth. Liberal or not..
    I know... but if you just go to D and 7 there is still a problem, no matter what is on the other side.. is there not? So those two cards cannot be the answer...

    eg if D has a 3, but 7 has any letter apart from D, you'd still be none the wiser?
    Last edited by Waharoa; 23rd November 2015 at 02:40.

  12. #12
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    Quote Originally Posted by Waharoa View Post
    I know... but if you just go to D and 7 there is still a problem, no matter what is on the other side.. is there not? So those two cards cannot be the answer..
    Only if there are more than 4 cards.

  13. #13
    Senior Member Waharoa's Avatar
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    Quote Originally Posted by kuhio View Post
    Only if there are more than 4 cards.
    But even with just 4 cards... it will only need two cards if a D appears on the 7 card? So that's not the definite minimum number every time is it? It's a remote chance... as I said in my first post?

  14. #14
    Senior Member kris-one's Avatar
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    Kuhio is correct, 2 cards - D & 7.

    My answer was same as Waharoa...thought 3 needed turning too.
    Last edited by kris-one; 23rd November 2015 at 03:08.




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    You are saying it could be 1 if the first card you turn over disproves the statement. But you need to cover the worst case (the first card confirms the statement) so the answer has to be 2.

  16. #16
    Senior Member Waharoa's Avatar
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    Quote Originally Posted by kris-one View Post
    Kuhio is correct, 2 cards - D & 7.

    My answer was same as Waharoa...thought 3 needed turning too.
    But that will only work some of the time? So it's not fullproof?

    Edit. Bugger Kuhio was right. My brain was assuming more cards... and of course you can't think like that... doh.
    Last edited by Waharoa; 23rd November 2015 at 03:41.

  17. #17
    Senior Member tnlawyer's Avatar
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    This crap reminds me of the LSAT. Hated that test...it was full of questions like this.
    Get out there in the game, don't sit up in the bleachers. That is the philosophy of pimps and preachers.

  18. #18
    Senior Member kris-one's Avatar
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    Its a maths problem, there is only one answer and it's D & 7!

    I seemed to assume that if D=3 then 3=D. I think that's a wrong assumption based on the wording of the question. I think.

    So whilst turning 3 might have a D on the other side it also may have for a J which wouldn't mean that Terry is lying.

    Apparently computer programmers did best in this... we need Kuhio to explain 555




  19. #19
    Senior Member kris-one's Avatar
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    Quote Originally Posted by tnlawyer View Post
    This crap reminds me of the LSAT. Hated that test...it was full of questions like this.
    Actually after programmers lawyers were next best! You have no excuse
    tnlawyer likes this.




  20. #20
    Senior Member tnlawyer's Avatar
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    Quote Originally Posted by kris-one View Post
    Actually after programmers lawyers were next best! You have no excuse
    No I did ok on the test but hated it. Spent countless hours practicing how to analyze and break down the questions.
    Get out there in the game, don't sit up in the bleachers. That is the philosophy of pimps and preachers.

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