Question

Let A = {1, 2, 3, 4, 6} and R = {(a, b) : a, b ϵ A, and a divides b}.

(i) Write R in roster form.

(ii) Find dom (R) and range (R).

Answer 1

Given: A = {1, 2, 3, 4, 6} 

(i) R = {(a, b) : a, b ϵ A, and a divides b} 

R is Foster Form is, 

R = {(1, 2), (1, 3), (1, 4), (1, 6), (2, 2), (2, 4), (2, 6), (3, 3), (3, 6), (4, 4), (6, 6)} 

(ii) Dom(R) = {1, 2, 3, 4, 6} 

Range(R) = {2, 3, 4, 6}