Divide the 12 balls into 4 groups of 3's. + X. ?$ l* [% v1 A" AWeigh group 1 & 25.39.217.76/ I6 ~5 X& X; i8 S5 c
then weigh group 2 & 3 : l9 x. E+ m6 a& h# p5.39.217.76If the results are Equal & Equal, it means the ball with the different weight is in group 4. $ }( d& p1 l3 ~' e3 a公仔箱論壇If the results are Equal & Unequal, it means the ball is in group 3.公仔箱論壇' I: O4 {* d; }7 W( i, O+ z7 Y
If the results are Unequal & Equal, it means the ball is in group 1.5.39.217.760 v- _+ i+ \. v6 J. _( @2 _+ W, z& E
If the results are Unequal & Unequal, it means the ball is in group 2.公仔箱論壇7 |) c: Y; g, E6 K
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Once you determine the group that contains the ball.: n6 ~$ A/ d( G6 @' b& C( \- I
Simply weigh two of the balls