Question: Let A = (-0,0) U{1,2} U [3, 0), then Ais O not open and not closed open and closed closed but not open open

Let A = (-0,0) U{1,2} U [3, 0), then Ais O not 

Let A = (-0,0) U{1,2} U [3, 0), then Ais O not open and not closed open and closed closed but not open open but not closed

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