i found the ans in 30 mins but dont know correct or not?
; M8 C) k; k! ?ans is too long! but concepts are something like that:9 S6 n' Y& V, }% y
seprate 4 groups 3 balls in one group! $ Q E2 _, c2 L
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!
$ Z$ |" c5 ]8 ~3 ~! a, ithe last part is 1ball vs 1ball! something like that |