Divide the 12 balls into 4 groups of 3's.7 `- j( S) o" Z: l) m+ t
Weigh group 1 & 2tvb now,tvbnow,bttvb) C8 N% y; x# j: N3 N3 ~
then weigh group 2 & 3
! P7 m z2 I1 z6 V% @If the results are Equal & Equal, it means the ball with the different weight is in group 4.
- F# e% ]5 S' Q# }If the results are Equal & Unequal, it means the ball is in group 3.
; J/ u7 m; z! ]4 Z- atvb now,tvbnow,bttvbIf the results are Unequal & Equal, it means the ball is in group 1.! M, x+ o( d/ T8 y( ~* s9 M
If the results are Unequal & Unequal, it means the ball is in group 2.
7 c8 C+ i7 L0 ~* x; x5.39.217.77tvb now,tvbnow,bttvb. i! l7 ]1 T( p$ G# G# i
Once you determine the group that contains the ball.
+ [6 J% J( S# l) s6 Z5.39.217.77Simply weigh two of the balls |