Question: 5 0 . Find i = 1 Ai and i = 1 Ai if for every positive integer i , a ) Ai = {

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

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