i find one solution that is similar5.39.217.77; _) d* z5 i0 E( M! n
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....0 @, ~$ v1 E5 G. F' W& b: j1 m6 f; L
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...