Divide the 12 balls into 4 groups of 3's.
4 y1 a8 q B0 R% B# d# U) Z) zWeigh group 1 & 2
, \% a+ h, Y2 q4 f& B; k' `( @then weigh group 2 & 3 `1 D- R. U( N- Y
If the results are Equal & Equal, it means the ball with the different weight is in group 4.tvb now,tvbnow,bttvb1 a7 S1 k7 ]' Y; N
If the results are Equal & Unequal, it means the ball is in group 3.' y1 q! K( C6 n7 s
If the results are Unequal & Equal, it means the ball is in group 1.
: p; \. k, ?3 J. ]# kIf the results are Unequal & Unequal, it means the ball is in group 2.
/ C' u7 D2 a- p3 S( u4 etvb now,tvbnow,bttvb
2 ^+ D, Q k4 g( l8 ftvb now,tvbnow,bttvbOnce you determine the group that contains the ball.
! l! @8 Q6 h o; K6 a( }" m6 Ztvb now,tvbnow,bttvbSimply weigh two of the balls |