Divide the 12 balls into 4 groups of 3's.
9 ?" ?- g6 Q: {: k" N) Rtvb now,tvbnow,bttvbWeigh group 1 & 2+ r2 E N$ R; z- n* U
then weigh group 2 & 3
% O, C1 ]# @) ?- J( t0 oIf the results are Equal & Equal, it means the ball with the different weight is in group 4.
; y6 X: C& n6 c8 E& w, @5.39.217.77:8898If the results are Equal & Unequal, it means the ball is in group 3.
- D2 m2 {4 B) k9 G5 UIf the results are Unequal & Equal, it means the ball is in group 1.tvb now,tvbnow,bttvb* K G* ]' \" k0 T; V( ^2 n
If the results are Unequal & Unequal, it means the ball is in group 2.
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Once you determine the group that contains the ball.
$ H8 r" N+ t4 O, u! M+ B3 }Simply weigh two of the balls |