i found the ans in 30 mins but dont know correct or not?公仔箱論壇# I2 _5 S5 V/ P# X% z
ans is too long! but concepts are something like that:公仔箱論壇4 k3 k! I" b7 P9 S8 O
seprate 4 groups 3 balls in one group! tvb now,tvbnow,bttvb: X$ n# a s6 X0 d4 r+ i$ {
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!
3 X* Z" q, N/ A" D5.39.217.76the last part is 1ball vs 1ball! something like that |