Divide the 12 balls into 4 groups of 3's.$ x$ ]3 \$ K7 }8 v) k7 M4 R! f
Weigh group 1 & 2
: S3 W2 J' V( e; C' c- ktvb now,tvbnow,bttvbthen weigh group 2 & 39 O6 O$ I- @- u. n. o
If the results are Equal & Equal, it means the ball with the different weight is in group 4.
+ y6 [" r! Q; B9 J% _# ?If the results are Equal & Unequal, it means the ball is in group 3.
1 e5 Y, k& H( w: h( d; z- bIf the results are Unequal & Equal, it means the ball is in group 1.5.39.217.76. J' c9 f, R" R7 W
If the results are Unequal & Unequal, it means the ball is in group 2." ?, F. \; J6 x- r
4 q2 d: w5 m" L: IOnce you determine the group that contains the ball.tvb now,tvbnow,bttvb" R# [7 d$ ^6 S/ [
Simply weigh two of the balls |