i find one solution that is similar # P' s& }( M- U7 ^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....2 i' B8 t, F& H# V& Z% 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...