i found the ans in 30 mins but dont know correct or not?公仔箱論壇# L# _2 W1 ~" J# X& j2 `6 j3 J% S
ans is too long! but concepts are something like that:tvb now,tvbnow,bttvb) d& ~& O) d1 H T k4 x( c
seprate 4 groups 3 balls in one group! ! {& F0 h, f# v% ?# o2 E, p+ W
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!
! Z. b& C& O9 F1 t1 }公仔箱論壇the last part is 1ball vs 1ball! something like that |