Question: If x = { 1 , 2 , 3 } and = { x , O , { 1 } , { 3 } ,

If x={1,2,3} and ={x,O,{1},{3},{1,3}}, be a topological space and A={1,2} is subset of x, then find frontier of A, i.e,Fr(A).
If x={1,2,3} and ={x,O,{1},{3},{1,3}}, be a topological space and A={1,2} is

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