Divide the 12 balls into 4 groups of 3's.tvb now,tvbnow,bttvb, U: _- d3 T( g0 e" y& r: y8 b
Weigh group 1 & 2 # a [" w* k7 ]3 H公仔箱論壇then weigh group 2 & 3 2 ?# W& ~- Q: ^* g2 }2 Cwww1.tvboxnow.comIf the results are Equal & Equal, it means the ball with the different weight is in group 4., I$ n+ r7 Y- {+ ]: O9 M
If the results are Equal & Unequal, it means the ball is in group 3.: J7 D% h1 i: _9 G( a
If the results are Unequal & Equal, it means the ball is in group 1.www1.tvboxnow.com2 ^/ k( g8 `" `/ l( I) _5 J
If the results are Unequal & Unequal, it means the ball is in group 2. " P1 f$ h, _( |4 H! C2 f: U {: |3 S! m+ B2 _
Once you determine the group that contains the ball.8 m: v, e4 q' X( ~4 o2 Z R
Simply weigh two of the balls