divde the 12 balls into 3 sets of 4.
# c/ q' s, e1 l5.39.217.76weight any 2 sets.5.39.217.769 N1 \! o: ]5 J. A2 [
if the 2 sets are equal, then you know the heavy one is in the third
* }9 A" `5 s r4 _2 I+ l; w- z! \! Pif one of the 2 is heavier, then the heavy one is in that set: Y, I/ C. f- D7 _/ F
then divide the 4 balls into 2.
2 f/ P0 m' ]1 v1 { f2 F8 fweigh them
. H. g# k4 S) {公仔箱論壇and divide the heavier into 1 L% U1 f4 ^* B2 S. j# b
and weight them.
/ r5 ]0 H- n4 R9 y3 x weighing and get the ans.
/ e" F$ J9 T9 C% H% o7 o# `in less than 15 secs. |