If A = {x | x is a colour of rainbow} and B = {white, red, green}

If A = {x | x is a colour of rainbow} and B = {white, red, green}, then A ∩ B is
(a) B
(b) {green}
(c) {red}
(d) {green, red}

Solution:

If P = {-1, 0, 1, 2, 5} and Q = {3, 5, 7}, then P ∪ Q is
(a) {5}
(b) {-1, 0, 1, 2, 3, 7}
(c) {-1, 0, 1, 2, 3, 5, 7}
(d) none of these

Solution:

If A and B are two sets, then A – B is defined as
(a) {x |x ϵ A or x ϵ B}
(b) {x | x ϵ A and x ϵ B}
(c) {x | x ϵ A and x ∉ B}
(d) {x | x ϵ B and x ∉ A}

Solution:

If A is any set, then A ∪ ϕ is
(a) A
(b) ϕ
(c) 2,
(d) none of these

Solution:

More Solutions:

• If A, B are two sets, then A ∪ B
• If ξ = (all digits in our number system}
• If A and B are two sets such that n(A) = 22, n(B) = 18
• If ξ={x : x ϵ N, r < 25} and A = {x : x is a composite number}
• If ξ = {x | x ϵ N, x ≤ 12}, A = {prime numbers} and B = {odd numbers}
• If ξ = {x : x ϵ N, x ≤ 12}, A= {x : x ≥ 7} and B = {x : 4 < x < 10}
• Given A = {students who like cricket} and B = {students who like tennis}
• In a city, 50 percent of people read newspaper A