i find one solution that is similar- ?6 o" O4 O& m) L
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.... / Y, F" a8 L& P5 ^) P# ^$ d0 xmaybe 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...