Divide the 12 balls into 4 groups of 3's. ( w G. P$ l1 H7 c公仔箱論壇Weigh group 1 & 27 F3 B" \* N" P ^
then weigh group 2 & 39 U& I! x2 {0 b, `8 K
If the results are Equal & Equal, it means the ball with the different weight is in group 4.! P$ F4 W* ]% ~5 r' ^3 Q
If the results are Equal & Unequal, it means the ball is in group 3.www2.tvboxnow.com3 D% P! u ~! b, m
If the results are Unequal & Equal, it means the ball is in group 1.tvb now,tvbnow,bttvb9 c6 ?1 m. g6 ]$ k) |. J$ r* N6 [
If the results are Unequal & Unequal, it means the ball is in group 2. 2 i; m# x2 j# ]* ?2 y1 Ntvb now,tvbnow,bttvb 4 Z z7 D2 C+ @4 H: G0 ]" u" d0 A) Z6 i公仔箱論壇Once you determine the group that contains the ball. 7 X7 T1 ~# o h @ v公仔箱論壇Simply weigh two of the balls