i found the ans in 30 mins but dont know correct or not?
! N) N( {% C& O. [6 stvb now,tvbnow,bttvbans is too long! but concepts are something like that:公仔箱論壇/ D( R( _3 H8 {; m; D J
seprate 4 groups 3 balls in one group! - l, A/ H, T+ c$ ]
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!公仔箱論壇% ?. f+ ^# m; }7 {
the last part is 1ball vs 1ball! something like that |