Resposta:

a) {1, 2, 3} ⊂ {1, 2}

b) (8, 3, 9) ≠ (9, 8, 3)

c) (2, 3, 6} ≠ {7, 3, 2}

d) {5, 5, 5} ⊂ {5}

e) {2, 8, 2} ≠ {8, 2}

f) {6, 1, 3} ≠ (3, 6)

Note: The symbol "⊂" means subset, and "≠" means not equal.