Extracted text: Let X= (1, 2, 3, 4, 5, 6) and let T1= (X, 4, (3), (1,2,3), (2,3,4), (2)} and T2 = (X, 4, (2), (1,2,3), (4,5,6). (2,4,5,6)) * O TL and T2 are both not topologies on X O T1 and T2 are both topologies on X O Tisatopology on X and T2 is not a topology on X O T1 is not a topology and T2 is a topology on X