i found the ans in 30 mins but dont know correct or not?, d* t5 g+ P& y. n7 o' b @# \
ans is too long! but concepts are something like that:5.39.217.76$ K# y4 N" F6 D9 }5 j
seprate 4 groups 3 balls in one group! tvb now,tvbnow,bttvb6 ^2 d) K, z7 _8 L0 j
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!
, ?1 F9 t$ F* z5 {公仔箱論壇the last part is 1ball vs 1ball! something like that |