take 4 balls as a group, 3 groups - A B C公仔箱論壇& p* k8 F) M& m
weigh A & B (ex. B heavier)' r$ ]/ b6 Z8 ~
then weigh B & C (B & C same weight)公仔箱論壇) z( b( o5 _* A6 {# t2 J: p
to find which group has the weight difference and find out is it (A is lighter)
& m2 C4 u# j0 w' l$ jtvb now,tvbnow,bttvbheavier or lighter( i: }' z5 C `2 w
then measure 2 vs 2 balls, EF vs GH, pick out the lighter group (EF lighter)5.39.217.77" E7 C* \! p& |# n2 ?% P. ^$ H! |; S
measure E vs F to find which 1 is lighter.... |