Try this

HOLY CRAP!!! it got it right like 6 times in a row then i musta got off track b/c it started goin wrong
ah ha i figured it out...but i wont ruin it for everyone...the only reason it was wrong is b/c my math was a lil off:rolleyes:
i did it 6 times and its always wrong.

it cant tell me the right symbol, i must be special. hehehe it only works on weak minds. ;)