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Do the math. A two-digit number, written xy, is equal to 10x + y. So when you subtract (x+y) from that number, you are left with 9x. Now look at the symbols besides the multiples of 9 from 9 (9*1) to 81 (9*9). Hmmmm....
Nice sound effect though.
Okay - I see the 9 thing, but the symbols are different. How does it know I picked 25 as a start instead of 94? It seems to pick the right one even though these two deliver different symbols. I mean, I know it's something like this but I don't get how it does that part.
25 - (2 + 5) = 18 = 9 * 2
94 - (9 + 4) = 81 = 9 * 9
It doesn't know what number you start with. When you do the math, you'll always end up with a multiple of nine, so those are the only numbers that matter. And if you check, they all have the same symbol.
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"Oh, look, a joke! How original! Thank you, but if I wanted my emotions stimulated pleasurably, I'd get a whore." - Donald B. Jones III