12-22-2004, 05:27 PM
you have a two digit number xy
xy - (x+y) = multiple of nine
every time 9, 18, 27, 36, 45, 54....are all the same symbol. they change each time
xy - (x+y) = multiple of nine
every time 9, 18, 27, 36, 45, 54....are all the same symbol. they change each time