Originally posted by Pharrell
It's an old trick lol.
The only possible numbers that can come out of this are: 9, 18, 27, 36, 45, 54, 63, 72, 81.
If you look clearly, all the numbers have the same symbol, simple as it is.
How does it know which one you got out of 9, 18, 27, 36, 45, 54, 63, 72, 81?