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

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

 

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

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