i found the ans in 30 mins but dont know correct or not?
, z3 y& z! e6 F0 c t/ v公仔箱論壇ans is too long! but concepts are something like that:6 _" q: N4 m2 O
seprate 4 groups 3 balls in one group!
1 K! |7 ~8 F! R( `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!
- l* b6 D8 Z7 N& Jtvb now,tvbnow,bttvbthe last part is 1ball vs 1ball! something like that |