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