i thing the answer is+ l' y' E8 E) J% X3 v/ y7 m! [
start with 4 on each side of the scale,this will have two possible outcome, same or diff.
: S) F+ _5 X0 n# s4 BTVBNOW 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。If the same then 4 that left over contain the odd ball. put 1 of the 4 to each side, two outcome, same or different again. Replace 1 from the remaining, if the same then left over is the odd or if different the replacement is the odd one. I didn't time myself but I think I take less than 30 minutes. There are two more possible out come but still need three weighing but I think I am running out of space. |