Find U2, A; and i=1 A; if for every positive integer i, a) A = {i, i + 1, i + 2,...}. b) A; = {0, i}. c) A₁ = (0, i), that is, the set of real numbers x with 0 < x < i. d) A; = (i, ∞), that is, the set of real numbers x with x > i.

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