Divide the 12 balls into 4 groups of 3's.. t% ^( g8 \# o/ z3 a
Weigh group 1 & 2公仔箱論壇, ~1 a/ i$ R; m4 n9 m4 a6 N
then weigh group 2 & 3, r0 R( X* @* |) c: r# D$ [# Q
If the results are Equal & Equal, it means the ball with the different weight is in group 4.5 V9 O4 P' p+ ^$ {
If the results are Equal & Unequal, it means the ball is in group 3. $ K5 o6 { ?8 K: A公仔箱論壇If the results are Unequal & Equal, it means the ball is in group 1. 2 w' U, R! B N( f5.39.217.77If the results are Unequal & Unequal, it means the ball is in group 2. 5 T J( ^7 \ v' \. w V/ J公仔箱論壇 ! t4 L7 A* R( x. @( X( O D5.39.217.77Once you determine the group that contains the ball. 3 D5 k+ d( s" l- N5 r1 a* HSimply weigh two of the balls