i found the ans in 30 mins but dont know correct or not?. z+ d7 D n+ b8 I' I7 o" J- I9 J7 k# J
ans is too long! but concepts are something like that:tvb now,tvbnow,bttvb% o. l# m/ p2 N! i1 J0 V
seprate 4 groups 3 balls in one group!
1 W. K- g2 c! a! U! W$ I公仔箱論壇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!
1 s8 `! Z6 E8 @& t% J公仔箱論壇the last part is 1ball vs 1ball! something like that |