1. divide 6 and 6, both sides will not equal公仔箱論壇& `3 R* p- K' b$ \
2. take any side of the 6, divide then 3 and 3, again both sides will not equal % f7 n: r1 ]0 htvb now,tvbnow,bttvb3. take any 2 and weigh them! d1 G7 T/ H8 z
if they equal, the one left is the ball.