Which of the following pairs of sets and disjoint
(i) {1, 2, 3, 4} and {X : X is a natural number and 4 ≤ X ≤ 6}
(ii) {a, e, i, o, u} and {c, d, e, f}
(iii) {X  : X is an even integer} and {X : X is an Odd integer}

If A = {3, 5, 7, 9, 11}, B = {7, 9, 11, 13}, C = {11, 13, 15} and D = {15, 17}; find
(i)  A ∩ B
(ii)  B ∩ C
(iii)  A ∩ C ∩ B
(iv)  A ∩ C
(v)   B ∩ D
(vi)  A ∩ (B ∩ C)
(vii) A ∩ D
(viii) A ∩ (B ∩ D)
(ix)  (A ∩ B) ∩ (B ∪ C)
(x)  (A ∪ B) ∩ (B ∪ C)

Let A = {x : x is a natural number}, B = {x : x is an even natural number}, C = {x : x is an odd natural number }, D = {x : x is a prime number}. Find
(i) A ∩ B
(ii) A ∩ C
(iii) A ∩ D
(iv) B ∩ C
(v) B ∩ D
(vi) C ∩D

Let A = {3, 6, 12, 15, 18, 21}, B = {4, 8, 12, 16, 20}, C = {2, 4, 6, 8, 10, 12, 14, 16} and D = {5, 10, 15, 20}. Find
(i)     A – B
(ii)    A – C
(iii)   A – D
(iv)   B – A
(v)    C – A
(vi)   D – A
(vii)  B – C
(viii) B – D
(ix)   C – B
(x)    D – B
(xi)   C – D
(xii)  D – C

If X = {a, b, c, d} and Y = {f, b, d, g}, find (i) X – Y (ii) Y – X (iii) X ∩ Y