sitsky

take 4 balls as a group, 3 groups - A B C1 N/ R: B* P+ w' N9 @( I
weigh A & B (ex. B heavier)
5 s: U1 @2 U4 I6 Othen weigh B & C (B & C same weight)
5 P8 r9 T: g1 t2 q3 h. D* l8 tto find which group has the weight difference and find out is it (A is lighter)tvb now,tvbnow,bttvb2 @; F( b3 {, W1 {$ D8 H1 v3 o3 h
heavier or lighter
6 w) R2 }$ }' c6 t( v公仔箱論壇then measure 2 vs 2 balls, EF vs GH, pick out the lighter group (EF lighter)
$ X  A" E' l0 d+ y  q3 W/ t% pmeasure E vs F to find which 1 is lighter....