take 4 balls as a group, 3 groups - A B C
9 F8 p5 b% `& H5 O3 ]+ tweigh A & B (ex. B heavier)
; Z( I/ _+ {3 d8 d4 q O公仔箱論壇then weigh B & C (B & C same weight)
) J" `: H! f' Ito find which group has the weight difference and find out is it (A is lighter)
# T& D2 ^* |) Q! D. nheavier or lighter
; @! C: I, t' m1 A( V公仔箱論壇then measure 2 vs 2 balls, EF vs GH, pick out the lighter group (EF lighter)
) S% a( U6 N8 Y' tmeasure E vs F to find which 1 is lighter.... |