Question

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

{ (a, b), (a, c), (b, a), (b, c), (c, a) }

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 are not from the set A. Hence, the given set of ordered pairs are not a relation from A to B.