Question

Let R5 = {(1,2), (1,4), (1,6), (2,2), (2,4), (2, 6), (3,2), (3,4), (3,6), (4,2), (4,4), (4,6), (5,2), (5,4), (5,6)} and R6 = {(1,2), (1,4), (1,6), (2,4), (2,6), (3,6)} be relations. How many ordered pairs are there in R5 U R6?

Answer 1

$R5\cup R6=$ {(1,2), (1,4), (1,6), (2,2), (2,4), (2, 6), (3,2), (3,4), (3,6), (4,2), (4,4), (4,6), (5,2), (5,4), (5,6)}

Answer: 15 ordered pairs