i found the ans in 30 mins but dont know correct or not?tvb now,tvbnow,bttvb$ V- E0 V! p$ ^' j/ ?. ]
ans is too long! but concepts are something like that:
8 n4 H' K8 Q8 }公仔箱論壇seprate 4 groups 3 balls in one group! tvb now,tvbnow,bttvb1 e# `$ D. b, E. T
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!
; _4 w# Y9 o9 X9 b9 s6 ?the last part is 1ball vs 1ball! something like that |