How do they do this?

[SueMermaid]

I am a scientist. I am so smart! I am so smart! S-M-R-T.
I mean S-M-A-R-T!

Yeah, my math was wrong. What? What are you all looking at?

 

[simbrooks]

Recheck your math

TwoBit

Err i did, 2 out of 8 times it got it wrong - i can guarantee that 18-1-8=9 and 0-0=0 and it didnt get the right symbol either of those times, but every other time it did.

Just to be scientific about it i even jotted down the symbol beforehand just in case, and those two times they didnt match! Maybe there is a glitch in the program?

 

[Rick Inman]

It doesn't take ANY math skills to figure this out - if you pick the same number every time.

BTW, 0 is a one digit number.