i found the ans in 30 mins but dont know correct or not?公仔箱論壇# |, m( @/ c2 T2 z: h
ans is too long! but concepts are something like that:公仔箱論壇' n0 ], K) J. b ]. b# _" f
seprate 4 groups 3 balls in one group!
% \! s& ~, ~8 H: p$ [( [tvb now,tvbnow,bttvbthe 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!
+ W6 B- d) C tthe last part is 1ball vs 1ball! something like that |