1. divide 6 and 6, both sides will not equal公仔箱論壇* x! q( G5 k U8 Z
2. take any side of the 6, divide then 3 and 3, again both sides will not equal 0 M3 { J; `' o; S3. take any 2 and weigh them公仔箱論壇8 Y0 t% ~$ w" v5 y% `( J/ F3 ~% }
if they equal, the one left is the ball.