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start with 4 on each side of the scale,this will have two possible outcome, same or diff.8 z# X7 L- t8 M: b2 `; t. i# r/ _
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. |