Divide the 12 balls into 4 groups of 3's. 3 s1 X. Q6 X0 N9 g公仔箱論壇Weigh group 1 & 2 ' s/ o" d) r& o5 U, X5.39.217.77:8898then weigh group 2 & 3 ; Y& Y8 D4 I0 G; _* d* lIf the results are Equal & Equal, it means the ball with the different weight is in group 4.5.39.217.77:8898$ N: d3 X$ a: {* k
If the results are Equal & Unequal, it means the ball is in group 3.公仔箱論壇 R3 X' _- O3 z; q6 e Q& l
If the results are Unequal & Equal, it means the ball is in group 1.5.39.217.77:8898( g: D( B' M% J( K/ z
If the results are Unequal & Unequal, it means the ball is in group 2. ; A* t3 ]* {# R, h0 p ) C7 Z1 ` c5 V4 s' R0 KOnce you determine the group that contains the ball.) I( x9 P K' i7 @* J: r# S/ J
Simply weigh two of the balls