jexmand

1st trial - put 6 balls at each side .. take out the lighter 6 balls
+ `" v( [. k; U* a9 w0 h公仔箱論壇2nd trial - put the heavier 6 balls by 3 balls at each side
, e$ [1 w6 ^3 L8 [0 C$ w& Hlastly, take out the lighter 3 balls.... now left 3 balls..
& ?6 t8 T3 F# c7 J5.39.217.763rd trial - put 1 ball on each side, left 1 ball on table. if both sides balance, the ball on table is the heaviest. if one side on the scale is heavier then it is the heaviest...