Mathematics
The Empty Set, Finite and Infinite Sets, Equal Sets
Practice questions
Which set is equal to {1, 4, 9, 16, 25}?If A = {x : x ∈ N, x is a factor of 31}, how many elements are in A?Let A = {x : x ∈ N, x is a perfect square less than 6}, where N = {1, 2, 3, ...}. What is A?What type of set is A = {x : x ∈ ℤ, x is even}?If A = {x : x ∈ ℕ, x² = 49} and B = {7}, which statement is correct?If A = {x : x ∈ ℕ, x is a factor of 48 and x is prime}, what is A?If A = {x : x ∈ ℕ, x is greater than 3 and less than 8}, what is the correct form of A?If A = {a, b, c, d} and B = {d, c, b, a, a}, how are A and B related?How many elements are in A = {x : x ∈ ℕ, x is a multiple of both 12 and 18 and x < 100}?Which of the following sets is not infinite?If A = {x : x ∈ ℕ and x + 5 = 5}, what kind of set is A?Which set is not equal to A = {1, 2, 4, 8}?If A = {x : x ∈ ℤ and x² − 4x + 4 = 0}, how many elements are in A?Let A = {x : x ∈ N, x is a real number greater than 2 and less than 3}. What is the correct conclusion about A?How many elements are there in the set B = {x : x ∈ ℤ, −3 ≤ x ≤ 3}?Let A = {2, 4, 6, 8} and B = {x : x ∈ ℕ, x is even and x < 10}. Which statement is correct?If C = {1, 1, 2, 3, 3, 3} and D = {3, 2, 1}, which conclusion is correct?Which set is called an empty set?If N = {1, 2, 3, …}, what type of set is {x : x ∈ N, x < 1}?Which statement is correct about the set {x : x ∈ Z, x² = 2}?