i found the ans in 30 mins but dont know correct or not?" {) a R/ z: g( ?) I
ans is too long! but concepts are something like that:公仔箱論壇2 x1 r& `: ?- q9 \
seprate 4 groups 3 balls in one group! tvb now,tvbnow,bttvb, S4 g) y. Q8 ~
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!tvb now,tvbnow,bttvb4 A) Q% n7 L. s$ ?& U2 T0 Y8 m
the last part is 1ball vs 1ball! something like that |