Divide the 12 balls into 4 groups of 3's.5.39.217.772 b* N" m( h8 P: F2 \5 e0 a
Weigh group 1 & 2公仔箱論壇# C' v0 [! d1 W
then weigh group 2 & 3 $ |, s( o0 y8 YIf the results are Equal & Equal, it means the ball with the different weight is in group 4. / X" b' \8 W( N |tvb now,tvbnow,bttvbIf the results are Equal & Unequal, it means the ball is in group 3.- C; B j0 t) E: S
If the results are Unequal & Equal, it means the ball is in group 1. 4 t( R9 O% j! ztvb now,tvbnow,bttvbIf the results are Unequal & Unequal, it means the ball is in group 2. 2 {" t+ [! V4 m2 A5.39.217.777 Z. {- F S7 _% E( _
Once you determine the group that contains the ball. ) b4 j; R5 Z6 Y- W. o$ pSimply weigh two of the balls