7 Up Trick

Can you figure out how this works???

1) Go to the link below. After reading each window, click on Fido in the lower right corner of the picture.

2) In the last window type in your answer in the white box using the keyboard (there is NO cursor).

3) Watch the paper in Fido’s hand. You will be amazed.. I’m actually scraping my jaw off the pavement.

http://digicc.com/fido/

Will let you know once I figure out how it’s done!

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9 thoughts on “7 Up Trick

  1. Ah, nice 🙂

    The sum of all the digits of the number that is the difference between the original and the permuted numbers is always a multiple of 9. So as long as you circle a number that is not a 0, the circled number is always the difference between the sum of the digits of the number you type in, and the next highest multiple of 9. Note then that the reason they ask you not to circle a 0 is that the computer wouldn’t be able to distinguish if you’ve circled a 0 or a 9. cheers.

  2. Let’s say you’re given 1234 and 3412. You subtract:

    3412 – 1234 = 2178

    So the possibles are 1, 2, 7, 8. Let’s say you picked “2”…. so 1, 7,
    and 8. And it gets 2. Amazing, you think?

    Watch me with some other numbers:

    4321 – 1234 = 3087
    4231 – 1234 = 2997
    4123 – 1234 = 2889
    4132 – 1234 = 2898

    Okay, that’s enough of a sample. Let’s add now, a step it skips for you:

    2 + 1 + 7 + 8 = 18
    3 + 0 + 8 + 7 = 18
    2 + 9 + 9 + 7 = 27
    2 + 8 + 8 + 9 = 27
    2 + 8 + 9 + 8 = 27

    The real trick is, people think it knows your number. It doesn’t… it
    just knows the digits HAVE to add up to a multiple of nine, because
    you’re subtracting digits from themselves (even in a funky order.)

    The only problem is if you circle a NINE or a ZERO, you can’t tell the
    difference. That’s why you’re not allowed to circle zeros, which makes
    it certain that you’re only circling 9’s in that case.

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