i found the ans in 30 mins but dont know correct or not?tvb now,tvbnow,bttvb- \% r/ \; _- R# U4 Q: h7 F
ans is too long! but concepts are something like that:4 d6 A$ I9 T, t
seprate 4 groups 3 balls in one group! www1.tvboxnow.com4 c2 y& E' g* n' i& 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!
! R# G! _ W; B3 \/ x9 f% d2 ]; I/ Dthe last part is 1ball vs 1ball! something like that |