i found the ans in 30 mins but dont know correct or not?公仔箱論壇5 d! p7 v* w5 O+ j7 Q# F
ans is too long! but concepts are something like that:
. c9 W6 d- B z# ]1 R* ?. v2 s5 n( I公仔箱論壇seprate 4 groups 3 balls in one group! 5.39.217.76# O* J# e1 y4 [$ V3 {
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!
9 D8 K+ g, o6 {4 e5.39.217.76the last part is 1ball vs 1ball! something like that |