1. divide 6 and 6, both sides will not equal1 t/ F+ _+ m* Y$ k+ V* K7 H
2. take any side of the 6, divide then 3 and 3, again both sides will not equal公仔箱論壇' m1 Z, U/ x$ ]% G" v/ c8 P% y
3. take any 2 and weigh them8 N8 M3 _3 T3 E
if they equal, the one left is the ball.