Question

Let x = {1, 2, 3, 4, 5) and Y = (1, 3, 5, 7, 9). Which of the following is a relation from X to Y?
(1) R = {(x, y) y = 2 + X, XE X, ye Y}
(2) R, = {(1, 1), (2, 1), (3, 3), (4,3), (5,6}
(3) R, = {(1, 1), (1.3), (3,5), (3, 7). (7,3), (5, 7)}
(4) R = {(1, 3). (2,5), (2,7). (5,9)}​

Answer 1

(4)R={(1,3),(2,5),(2,7),(5,9)

This is the the correct answer because each element in Domain have unique images in Y