Divide the 12 balls into 4 groups of 3's.
1 C+ H. ]7 p& u/ X" A0 btvb now,tvbnow,bttvbWeigh group 1 & 2公仔箱論壇7 m5 a* q. T* {9 s
then weigh group 2 & 3
! u8 C" I5 b. S/ |* x h% UIf the results are Equal & Equal, it means the ball with the different weight is in group 4.tvb now,tvbnow,bttvb2 ^3 H7 J( q" T3 o& r4 G( O- q2 n
If the results are Equal & Unequal, it means the ball is in group 3.
+ C, p a$ o1 v: p6 Ktvb now,tvbnow,bttvbIf the results are Unequal & Equal, it means the ball is in group 1.
: |3 r" p. g& o p I oIf the results are Unequal & Unequal, it means the ball is in group 2.公仔箱論壇" I& v# G" u8 W H& \" _! S
" J$ {. r3 M+ aOnce you determine the group that contains the ball.
: } U J/ K. ^. w/ bSimply weigh two of the balls |