7. Determine the set A; if, for every positive integer i (0.25 points each), i=1 (a) A; = {-i, -i + 1, ..., -1,0, 1, ..., 1 1, i} (b) A; = {-i,i} Note that here you don't necessary need to provide the answer as an explicit set of elements. You can also describe the set if that seems simpler