Question

Let A = {3,4,7, 8) and B = {1, 7, 10} then show that R = {(3, 1), (4, 12)
is a relation from A to B.​

Answer 1

According to question

i doesn't think that r is relation

as (4,12) doesn't existing.

Answer 2

A is not belongs to B because A and B no. not same on brackets .