sitsky

take 4 balls as a group, 3 groups - A B C公仔箱論壇1 ~5 c; ?( U( q+ z
weigh A & B (ex. B heavier)
5 A( ?6 O4 d$ `then weigh B & C (B & C same weight)公仔箱論壇4 s7 g# B/ W) i- P/ T; }2 y+ @
to find which group has the weight difference and find out is it (A is lighter)公仔箱論壇5 H3 x+ P$ k8 L# p& m
heavier or lighter
2 Z  C. E+ h- h  p) E" k- S* Ethen measure 2 vs 2 balls, EF vs GH, pick out the lighter group (EF lighter)
' E9 d# ~: e  c: q9 g3 E$ emeasure E vs F to find which 1 is lighter....