5. Find the supremum and infimum of the following sets: 0, (-10, 10), (-00, 00), n21/}, UPR(1/i}, ni[1/i, 1], Up[1/i, 1], {x: x = 1/i, i = 1, 2, ...}, {x:x = -1/i, i = 1,2, ...}, {x:x = i, i = 1, 2, ...}, and {x: x = -i, i = 1, 2, ... )