i find one solution that is similar # r- Y i* \, g7 i. t8 ~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.... * f$ d$ e1 \/ M6 gmaybe 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...