i found the ans in 30 mins but dont know correct or not?' w; T, r9 L4 a7 Y: R% f
ans is too long! but concepts are something like that:* b9 ?/ M( @% \4 {7 G6 t
seprate 4 groups 3 balls in one group!
1 H' V+ `& l; t" n, Ktvb 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!公仔箱論壇, `7 i- f' l& L8 C( e# l- h
the last part is 1ball vs 1ball! something like that |