i thing the answer is
: _' T3 E6 \2 E9 k! h0 d `. f9 @tvb now,tvbnow,bttvbstart with 4 on each side of the scale,this will have two possible outcome, same or diff.公仔箱論壇9 A3 W' L# Y1 H3 t5 D
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. |