1. divide 6 and 6, both sides will not equal$ r5 y2 N! i+ v' [4 G
2. take any side of the 6, divide then 3 and 3, again both sides will not equal公仔箱論壇5 C( _1 j0 i7 o3 N* Z) P
3. take any 2 and weigh them公仔箱論壇0 \/ p; L5 \; i, K9 b" p6 a
if they equal, the one left is the ball.