Divide the 12 balls into 4 groups of 3's.
' K. U5 i, q# d/ k' I+ [Weigh group 1 & 2tvb now,tvbnow,bttvb$ }$ G5 y/ K) q9 j* g& ?" L
then weigh group 2 & 3
* w6 w' [: g! G' ?' t5 ^If the results are Equal & Equal, it means the ball with the different weight is in group 4.tvb now,tvbnow,bttvb- S/ K1 n% V5 R5 X) h- i
If the results are Equal & Unequal, it means the ball is in group 3.9 ~; O. F5 w- C# ?- z# E6 R
If the results are Unequal & Equal, it means the ball is in group 1.. F$ F; _# W, i+ L2 m
If the results are Unequal & Unequal, it means the ball is in group 2.tvb now,tvbnow,bttvb. k3 {% O! i( W0 G. O
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Once you determine the group that contains the ball.
, p, N% {& x5 j1 F2 c7 `Simply weigh two of the balls |