1. divide 6 and 6, both sides will not equal公仔箱論壇# D' _ h9 M( S7 U. _1 W
2. take any side of the 6, divide then 3 and 3, again both sides will not equal* _( g2 z# y) D+ Z' O) E
3. take any 2 and weigh them * I' q* v) ~# g& A. g公仔箱論壇if they equal, the one left is the ball.