i find one solution that is similar* x/ q: @7 C9 _& M o8 j
but i can't specify the heavier one is abnormal or the lighter one is abnormal when the case that has only two balls left....9 q& m8 [) T* R4 l* E( w
maybe there is a better one, let me see sin
actually this question always have someone asked, the calculation is very complicated, should give a no. of each ball, and first weight it in 6-6, and .... forgot...