Question

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

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

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 not from set A and the y-coordinates are not from the set B. Hence, the given set of ordered pairs is not a relation from A to B.