Question

Let A = {2, 4, 5, 7} and b = {1, 2, 3, 4, 5, 6, 7, 8}. 

Let R = {(x, y) x ϵ A, y ϵ B and x divides y}. 

(i) Write R in roster form. 

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

Answer 1

Given: A = {2, 4, 5, 7} and b = {1, 2, 3, 4, 5, 6, 7, 8} 

(i) R = {(x, y) x ϵ A, y ϵ B and x divides y} 

So, R in Roster Form, 

R = {(2, 2), (2, 4), (2, 6), (2, 8), (4, 4), (4, 8), (5, 5), (7, 7)} 

(ii) Dom(R) = {2, 4, 5, 7} 

Range(R) = {2, 4, 5, 7, 6, 7, 8}