11.* 1 point the sequence < 1, -1, 1, -1, 1, -1, ... >has () no limit point b) only one limit point ()two limit points (d) an infinite number of limit points o

11.* 1 point The sequence < 1, -1, 1, -1, 1, -1, ... >has () no limit point b) only one limit point ()Two limit points (d) An infinite number of limit points O a O b O Od 12. 1 point The union of a infinite number of closed sets need not be a (a) Closed set () Bounded set (b) Open set (d) Unbounded Set O a O O O d