Question

Let A = {1, 2, 3, 4} and B = {a, b, c}. State, which of the given are relations from A to B.

{ (1, a), (1, b), (2, b), (3, c), (4, c) }

Answer 1

For a set of ordered pairs to be a relation from A to B, then the x-coordinates of the ordered pairs should be from A and the y-coordinates should be from B.
Now, in the given set of ordered pairs, the x-coordinates of the ordered pairs are from set A and the y-coordinates are from the set B. Hence, the given set of ordered pairs is a relation from A to B.