(i) X ∪ Y = {1, 2, 3, 5} X ∩ Y = {1, 3}

(ii) A ∪ B = {a, b, c, e, i, o, u} A ∩ B = {a}

(iii) A = {3, 6, 9, 12,…….. } B = { 1, 2, 3, 4, 5, 6}

∴ A ∪ B = {l, 2, 3, 4, 5, 6, 9, 12, ………….. }

(iv) A = {2, 3, 4, 5, 6} B = {7, 8, 9}

A ∪ B = {2, 3, 4, 5, 6, 7, 8, 9}

A ∩ B = {2, 3, 4, 5, 6, 7, 8, 9}

(v) A ∪ B = {1, 2, 3} = A

A ∩ B = φ = B