Question

If A = {2, 4, 6, 9} B = {4, 6, 18, 27, 54} and a relation R from A to B is defined by R = {(a, b): a ∈ A, b ∈ B a is factor of b and a < b}, then find in roster from, Also find its domain and range

Answer 1

Given, A = {2, 4, 6, 9} and B = {4, 6, 18, 27, 54} and 

R = {(a, b): a ∈ A, b ∈ B, a is a 

factor of b and a<b} 

Roster form 

R = {(2, 4), (2, 6), (2, 18), (2, 54), (6, 18), (6, 54), (9, 18), (9, 27), (9, 54)} 

Domain of R = {2, 6, 9} 

Range of R = {4, 6, 18, 27, 54}