Divide the 12 balls into 4 groups of 3's.tvb now,tvbnow,bttvb6 z, Z) e' C- c4 h* V: `
Weigh group 1 & 21 [7 w+ v) I# k: D
then weigh group 2 & 3 0 V! K! \3 P: ?5.39.217.76If the results are Equal & Equal, it means the ball with the different weight is in group 4. t3 y' O' ]8 `( T2 Q/ j" Y3 J公仔箱論壇If the results are Equal & Unequal, it means the ball is in group 3.公仔箱論壇: S9 P+ V8 t, E- v- x9 a8 I
If the results are Unequal & Equal, it means the ball is in group 1. % j- ]9 z6 ?3 p公仔箱論壇If the results are Unequal & Unequal, it means the ball is in group 2. , C+ y) _% o8 G1 c5.39.217.76 0 K! b$ U+ E* }Once you determine the group that contains the ball.9 V9 P1 f3 v' S1 Y4 D" [% _8 t
Simply weigh two of the balls