i found the ans in 30 mins but dont know correct or not?公仔箱論壇% `! e2 u# A$ k, H
ans is too long! but concepts are something like that:
9 ^! e8 ]7 c [ k4 Mwww2.tvboxnow.comseprate 4 groups 3 balls in one group!
) b7 f/ j0 d* a- Nthe 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!
3 i3 O9 c' ?9 M, l' ]tvb now,tvbnow,bttvbthe last part is 1ball vs 1ball! something like that |