If A = {1, 2, 3} and B = {3, 4, 5}, what is A ∪ B?

If A = {x | x is a prime number less than 10} and B = {x | x is an even number less than 10}, what is A ∩ B?

Given the universal set U = {1, 2, 3, 4, 5, 6, 7, 8} and set A = {2, 4, 6}, what is A' (the complement of A)?

Let A and B be two sets such that n(A) = 20, n(B) = 30 and n(A ∪ B) = 40. What is n(A ∩ B)?

Which of the following is a singleton set?

If A = {x : x is a letter in the word 'LOYAL'} then what is the cardinality of A?

Which of the following represents the empty set?

If A ⊆ B, then what is A ∪ B?

What is the power set of the set A = {a, b}?

Let R be the set of real numbers and Q be the set of rational numbers. What does R - Q represent?