Mathematics
The Empty Set, Finite and Infinite Sets, Equal Sets
Practice questions
If A is the set of natural-number divisors common to 12 and 18, and B = {1, 2, 3, 6}, which statement is correct?If A is the set of positive prime numbers less than 7 and B = {2, 3, 5}, choose the correct statement.Which statement is correct about A = {x ∈ ℤ : x² + x + 1 = 0}?If A = {x ∈ ℝ : x² − 6x + 9 = 0} and B = {3, 3, 3}, which statement is correct?What is A = {x ∈ ℤ : x is even and x² = 2x}?If A = {x ∈ ℕ : x is a multiple of 20 and x < 20}, which set is A?If A = {x ∈ ℤ : x is divisible by 6} and B = {x ∈ ℤ : x is divisible by both 2 and 3}, which statement is correct?If A = {x ∈ ℕ : x is divisible by 4} and B = {4, 8, 12, ..., 40}, which statement is correct?What is the correct statement about A = {x ∈ ℝ : 0 ≤ x ≤ 0}?If A = {x ∈ ℝ : 0 < x < 0}, what is A?If A = {x ∈ ℤ : −1 < x < 1} and B = {0}, which statement is correct?If A = {x ∈ ℕ : x is a divisor of 15} and B = {x ∈ ℕ : x < 15 and x divides 15}, which statement is correct?If A = {x ∈ N : x is divisible by 5 and x ≤ 100}, what is n(A)?If A = {x ∈ Z : x is divisible by 10 and 0 < x < 100}, which is A?What type of set is A = {x ∈ ℝ : x² + 1 ≤ 0}?If A = {x ∈ ℤ : x² − 9 < 0}, how many elements does A have?If A = {x ∈ N : x lies between 9 and 10}, what is A?If A = {x ∈ Q : 1 < x < 2}, which statement is correct?If A = {x ∈ R : x is both rational and irrational}, what will A be?If A = {x ∈ R : x is rational} and B = {x ∈ R : x has a terminating or repeating decimal form}, what is correct?