i found the ans in 30 mins but dont know correct or not?tvb now,tvbnow,bttvb4 C, S8 C K2 U( N: L/ l
ans is too long! but concepts are something like that:tvb now,tvbnow,bttvb+ z' {- v; A f; c
seprate 4 groups 3 balls in one group! tvb now,tvbnow,bttvb. P8 j4 z) i- l2 Z
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!- V7 O, Z- b9 h9 A- Q; K0 Z# K
the last part is 1ball vs 1ball! something like that |