i found the ans in 30 mins but dont know correct or not? Y0 G' M4 D" [8 y/ H
ans is too long! but concepts are something like that:
' e( {2 Y; }$ E6 [, |5 D7 T" T4 Utvb now,tvbnow,bttvbseprate 4 groups 3 balls in one group!
0 Z6 r7 M) c5 o1 y5 H. Y' c5.39.217.77the 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!公仔箱論壇1 I5 G! G) S' l* n" S) T( J
the last part is 1ball vs 1ball! something like that |