divde the 12 balls into 3 sets of 4.
2 Z* t i$ g( `! X+ {$ fweight any 2 sets.
0 D: \ u7 r* r1 Utvb now,tvbnow,bttvbif the 2 sets are equal, then you know the heavy one is in the third( i/ k: D4 N4 ]8 B; h3 c
if one of the 2 is heavier, then the heavy one is in that setTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。; n. u+ ?4 _* Q. A/ o: t' G: r9 m
then divide the 4 balls into 2.公仔箱論壇% V6 v" y2 ?7 [4 S% L5 d3 m: y
weigh themTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。5 [1 W6 S q: }
and divide the heavier into 1) Z$ i$ Y/ x, C% {* [' M
and weight them.公仔箱論壇1 p+ A$ o5 N. g B/ M- x; t! P" S
3 x weighing and get the ans.
2 v- {# |: B: Dtvb now,tvbnow,bttvbin less than 15 secs. |