here is a (I think) more simple explanation...no matter what 2 digit you pick, the result will always be a multiple of nine (9, 18, 27, 36, 45, 54, 63, 72, 81) so, every time you go on this site, they randomly put a specific symbol for theses numbers, in other words: 9, 18, 27, 36, 45, 54, 63, 72, 81 always have the same symbol, but the symbols randomly change when you click try again. Got it?
