1. divide 6 and 6, both sides will not equal 3 c4 L+ ?+ U! r& x) v# ]4 z公仔箱論壇2. take any side of the 6, divide then 3 and 3, again both sides will not equaltvb now,tvbnow,bttvb% S( z# n) J R* x3 S
3. take any 2 and weigh them1 b, I( F. f4 i2 ~3 u% C" s
if they equal, the one left is the ball.