Divide the 12 balls into 4 groups of 3's. - u0 S: _* F" D% W公仔箱論壇Weigh group 1 & 2) b: s6 Z5 k" L# g+ J: l
then weigh group 2 & 3 {2 l* }' M: I- e) ]www3.tvboxnow.comIf the results are Equal & Equal, it means the ball with the different weight is in group 4. 8 t& T# t2 W; v$ W% F. ?If the results are Equal & Unequal, it means the ball is in group 3.公仔箱論壇, B* s4 A* L! w( U3 X
If the results are Unequal & Equal, it means the ball is in group 1.$ x' O9 g4 h) f
If the results are Unequal & Unequal, it means the ball is in group 2. ' j% a! X) o# B2 \+ A, u- ~# d 4 F- Q5 I3 O& A+ {2 [8 L0 yOnce you determine the group that contains the ball. . J P0 e& k, Ewww3.tvboxnow.comSimply weigh two of the balls