12 balls names A B C D E F G H I J K L: U. l& ] d, g7 c. K" R
1St A B C D : E F G H if balance tvb now,tvbnow,bttvb3 l" T% Y& X6 k
2nd A B (or either 2 of A-H) : I J if again balance if A B > I J (implies the different is light ball is I or J)
. _ X- s& J" _8 J- ?! R* Atvb now,tvbnow,bttvb3rd A (or either A-J) : K if again balance 3rd I : J (the lighter is different)6 F7 r& Y! `- q
L is different |