NCERT Solutions
Class 11 Maths
Relations and Functions

Ex.2.2 Q.5
Let A = {1, 2, 3, 4, 6}. Let R be the relation on A defined by
{(a, b): a, b ∈A, b is exactly divisible by a}.
(1) Write R in roster form
(2) Find the domain of R
(3) Find the range of R.
Given, A = {1, 2, 3, 4, 6}, R = {(a, b): a, b ∈ A, b is exactly divisible by a}
(1) R = {(1, 1), (1, 2), (1, 3), (1, 4), (1, 6), (2, 2), (2, 4), (2, 6), (3, 3), (3, 6), (4, 4), (6, 6)}
(2) Domain of R = {1, 2, 3, 4, 6}
(3) Range of R = {1, 2, 3, 4, 6}