i found the ans in 30 mins but dont know correct or not?tvb now,tvbnow,bttvb6 _1 C/ t+ i4 s$ O- ]
ans is too long! but concepts are something like that:
: {* c: E9 V! _公仔箱論壇seprate 4 groups 3 balls in one group!
# s2 T3 Y* U* I- ithe 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!
' K! _3 G: p; ntvb now,tvbnow,bttvbthe last part is 1ball vs 1ball! something like that |