Divide the 12 balls into 4 groups of 3's.www3.tvboxnow.com1 L0 _$ ~/ G6 t+ {$ N
Weigh group 1 & 2
7 L. i3 I9 Q, twww3.tvboxnow.comthen weigh group 2 & 3
% ~9 Y) S! D& { u! Ewww3.tvboxnow.comIf the results are Equal & Equal, it means the ball with the different weight is in group 4.8 O' B/ g, Q2 i/ N E
If the results are Equal & Unequal, it means the ball is in group 3.
( O/ M" V _/ m7 v( Itvb now,tvbnow,bttvbIf the results are Unequal & Equal, it means the ball is in group 1.
. M& ]( n/ h% A# dtvb now,tvbnow,bttvbIf 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.
7 E5 Z1 C% |' l1 qtvb now,tvbnow,bttvbSimply weigh two of the balls |