i found the ans in 30 mins but dont know correct or not?
: A0 x3 I& v7 p- g8 P; V9 Mtvb now,tvbnow,bttvbans is too long! but concepts are something like that:公仔箱論壇+ a2 j- \# O2 ~; \
seprate 4 groups 3 balls in one group! : m4 o3 J4 R6 j& H9 A- S. N( v
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!
8 D4 R' J7 q; ?* r- Itvb now,tvbnow,bttvbthe last part is 1ball vs 1ball! something like that |