i found the ans in 30 mins but dont know correct or not?tvb now,tvbnow,bttvb0 d/ K6 O1 K, X' U$ V
ans is too long! but concepts are something like that:公仔箱論壇2 [$ B- k$ Q( u' P! z
seprate 4 groups 3 balls in one group!
5 s1 n: P" U/ m" ^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!
2 A8 u; w- w. V& a& p1 S6 xtvb now,tvbnow,bttvbthe last part is 1ball vs 1ball! something like that |