See if you can find out why this works.

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I don't know how this works but it is very interesting how it knows what your thinking? I tried it many times using numbers my son and I would say randomly and it work everytime...Amazing!!!
 
The way you subtract the numbers will always get you a multiple of nine - 9,18,27,36,45,54,63,72,81

Then there a few extra number that have the same symbol just to throw you of, but you will never get those numbers. Pretty cool.
 
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Only certain numbers can be generated by this technique and they will all have whatever symbol is going to show in the crystal ball. They keep rotating the symbols withing the numbers but look at 9, 18, 27, (there is a pattern up to a point) and then some others that fall into it the mix.
 
Cool. I got freaked out when I was just picking out symbols (without picking numbers) and the crystal ball was getting it right. But it has missed it a few times now...
 
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If the crystal ball could actually read your mind, why do you have to do the math??? Why not just pick a symbol and have the crystal ball display the symbol you picked???



As preveiously stated, the math formula restricts the results of the math to a handful of values and those numbers are spread around the table which is the main deception, and makes it look like there are a lot of random symbols to choose from.



...Rich
 
It always amazes me how easily even simple math and/or logic can be manipulated to confound the vast majority of people...



Take any two digit number--I'll use "XY" (X is the first digit, Y is the second.)

The number is equal to 10*X + Y



Now we need to subtract the sum of the two digits:

(10*X + Y) - (X + Y)

which is...

10*X + Y - X - Y

The Y's cancel, leaving us...

10*X - X

which is...

9*X

which, so long as X is a positive integer (which is the case per the definition of this problem), is always a multiple of 9. Further, since X has a maximum value of 9, it's only the multiples of 9 less than or equal to 81 that matter.



And every multiple of 9 less than or equal to 81 always has the same symbol. They rotate it every time you refresh the page--but they always match.
 
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