klleung72781

Divide the 12 balls into 4 groups of 3's.
/ H3 V: b9 ?5 A6 x  bWeigh group 1 & 2tvb now,tvbnow,bttvb9 }  O9 |5 k" j. N5 L5 U0 _. s
then weigh group 2 & 3. V$ ?( ~+ d+ q' ~( X
If the results are Equal & Equal, it means the ball with the different weight is in group 4.
9 k! M. w, }9 m& [9 I- E5.39.217.76If the results are Equal & Unequal, it means the ball is in group 3.
+ D* `% m% ^& \1 X4 u/ S5.39.217.76If the results are Unequal & Equal, it means the ball is in group 1.
1 M! G* u0 F4 Z- a) Y, V' B+ I0 ftvb now,tvbnow,bttvbIf the results are Unequal & Unequal, it means the ball is in group 2.公仔箱論壇$ o1 K' w$ g- b, S7 S& `5 X" w5 A
tvb now,tvbnow,bttvb: n  g6 u, e# D9 i
Once you determine the group that contains the ball." x* v& m( L1 u" |: k1 u
Simply weigh two of the balls