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Divide 3 groups first.tvb now,tvbnow,bttvb* F( ~- K9 J( `4 [3 |7 I' ?
i.e. 4 x 4 x 4.
/ W6 G+ a& b) B- F公仔箱論壇Weight any 2 groups [1st]
% d8 l$ c+ `8 t9 X5.39.217.76then you will know the heavier ball in which group.
# [  L5 \" @$ w# k: ~tvb now,tvbnow,bttvbWeight any 2 balls in that group [2nd]5.39.217.76/ [& |& j7 _- x8 y6 |! P
then you will know the heavier ball in which 2 balls.5.39.217.76# r# c. Y# M% z5 ?3 U
Repeat again in remainders [3rd]* d! G8 l! b, k) n, ]3 a; y6 N5 {
Got the heavier ball.