take 4 balls as a group, 3 groups - A B C5.39.217.76 w7 A; I) {4 v1 \3 S: s7 C* n* n
weigh A & B (ex. B heavier)" k0 {7 ?5 {: E3 L
then weigh B & C (B & C same weight)
2 P6 e; h: {9 ~( Z+ b U5.39.217.76to find which group has the weight difference and find out is it (A is lighter)
Y2 X0 K- J9 b+ A6 ~( Lheavier or lighter5.39.217.76$ x t, B: ?, W, n2 U% ]: z5 X$ m
then measure 2 vs 2 balls, EF vs GH, pick out the lighter group (EF lighter)公仔箱論壇' S$ }! o% [# h% V: Z
measure E vs F to find which 1 is lighter.... |