i found the ans in 30 mins but dont know correct or not?
* O( O/ p0 I: p- rans is too long! but concepts are something like that:os.tvboxnow.com2 l: o4 k+ v x) s! o- T- o9 j
seprate 4 groups 3 balls in one group! tvb now,tvbnow,bttvb0 O1 T! \7 V+ v& y, A
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!; v {: h4 C- b% r2 D& H
the last part is 1ball vs 1ball! something like that |