i found the ans in 30 mins but dont know correct or not?
" P: H& V, ?' d# U- u' Mtvb now,tvbnow,bttvbans is too long! but concepts are something like that:9 t3 |* J! Z6 ^; r
seprate 4 groups 3 balls in one group! tvb now,tvbnow,bttvb8 G9 f% z2 J# z8 g7 L4 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!4 G" X- q: ^9 `' x- h
the last part is 1ball vs 1ball! something like that |