i found the ans in 30 mins but dont know correct or not?tvb now,tvbnow,bttvb5 ~( k1 @. v6 a, }7 P+ r
ans is too long! but concepts are something like that:
) K: E& A' U# ?6 A公仔箱論壇seprate 4 groups 3 balls in one group! ! o1 G& m6 y; f" y
the important part is the 2nd times which need to find out the fake ball is heavier or lighter by use the normal ball that u find at the first time!
2 l( _, J: r3 y1 |5.39.217.77the last part is 1ball vs 1ball! something like that |