i found the ans in 30 mins but dont know correct or not?公仔箱論壇; |) J/ r" B, R; D% L% g$ y! c
ans is too long! but concepts are something like that:
1 O0 w; J. o0 B公仔箱論壇seprate 4 groups 3 balls in one group! # O( L) h5 z, A0 o- ~
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!
+ c m: y$ L) L7 D3 t, Qtvb now,tvbnow,bttvbthe last part is 1ball vs 1ball! something like that |