Tuesday, August 30, 2005

Can't figure this one out

Came to know of this site from my colleague at work today. I am completely stumped by this.. This seems to read your mind. Obviously there is some trick to this.. But can't figure it out..

Mind Reader

Can you figure this one out ?


  1. Dear Ram,

    The trick I believe is, when you add the two digits of a two digit number and subtract the sum from the original two digit number, the end product will be a multiple of nine.


    23: 2 + 3 = 5, 23 - 5 =18
    77: 7 + 7 = 14, 77 - 14 = 63

    If you take a closer look, the numbers 0,9,18,27,36,45,54,63,72,81,90 will have the same symbols. To add to the trick, number 99 may have a different symbol, because 99 is not reachable.
    Further, the symbol changes every other time you try.

    Hope this helps.

    Harish V, Kuwait.

  2. Exactly Harish, all multiples of 9 have the same symbol. Any two digit number less its sum of digits give a multiple of 9. And every time the symbol changes for the multiples of 9 to fool the user.

  3. Ram, i find it b4 reding the comments!!! Harish and Vijai, there you go! The multiples of 9 is the same symbol that will be the answer which changes randomly everytime the page is refreshed!!!!

  4. Harish / VijaiKrishna / Sundaresan

    Yes.. you are absolutely correct..

    After I started it for some more time, it dawned on me.

    The change of symbols an interesting ploy to divert your attention..

  5. Visu, I was stumped by it as well a few weeks back. People at home were thrilled..!!

    Thanks to Harish..now I a know how it works.!!!