Mathematics
Sets and their representations
The Empty Set, Finite and Infinite Sets, Equal Sets
Practice questions
If K = {x ∈ ℕ : x is a factor of 20}, which statement is correct?Which of the following pairs represents equal sets?What is L = {x ∈ ℕ : x is a two-digit number and the sum of its digits is 3}?If U = {x ∈ ℤ : x³ = x}, which is the roster form of U?Which option gives the most accurate set-builder form of V = {4, 8, 12, 16, 20}?If W = {x ∈ Z : 1 ≤ x² < 25}, how many elements does W contain?Which option gives the roster form of Q = {x : x is a distinct letter of the word “mathematics”}?If R = {x ∈ ℕ : x is a divisor of 36 and x is a perfect square}, which of the following is R?For Y = {x ∈ N : x ≤ 30 and x is divisible by neither 2 nor 3}, which elements from 1 to 10 belong to Y?If Z = {x ∈ Z : (x − 1)(x + 2) = 0}, what is the correct roster form of Z?Which option correctly describes N = {7, 14, 21, 28, 35}?If A = {x ∈ Z : −5 ≤ x < 2 and x is even}, what is A?Which set is B = {x ∈ N : x² is a two-digit number and x < 10}?If C = {x ∈ N : x is a factor of both 15 and 25}, what is C?Which option gives the correct set-builder form of D = {0, 2, 4, 6, 8}?Which set is E = {x ∈ N : x + 2 is a divisor of 10}?If G = {x ∈ Z : x² < 2x + 8}, which is the correct roster form of G?Which option is the roster form of I = {x ∈ N : 50 < x < 70 and x is divisible by 5}?What is J = {x ∈ N : x is a divisor of 30 and x > 5}?If O = {x ∈ Z : |x| ≤ 2}, what is the correct roster form of O?