Divide the 12 balls into 4 groups of 3's. ) I" Y# q, p- T) j6 KWeigh group 1 & 2% @% ~5 Z) G7 M. A1 z
then weigh group 2 & 38 }% `( O5 c# b, `& ~0 G
If the results are Equal & Equal, it means the ball with the different weight is in group 4. ' y, ~) V5 g s* Y" V! M公仔箱論壇If the results are Equal & Unequal, it means the ball is in group 3.5.39.217.77/ r/ o! j# h) r' r
If the results are Unequal & Equal, it means the ball is in group 1. 0 X5 E6 C5 v% I* ftvb now,tvbnow,bttvbIf the results are Unequal & Unequal, it means the ball is in group 2. ! k9 g7 F4 O! r, ]1 p 3 f8 \6 V6 x( r+ R7 a" t# O4 t9 g5.39.217.77Once you determine the group that contains the ball. `/ _+ ^( _8 m5 c! v公仔箱論壇Simply weigh two of the balls