Question

Let X = {1, 2, 3, 4} and Y = {1, 5, 9, 11, 15, 16}
Determine which of the set are functions from X to Y.

(b) f₂ = {(1, 1), (2, 7), (3, 5)}

Answer 1

(b) Given:
f₂ = {(1, 1), (2, 7), (3, 5)}
f₂ is not a function from X to Y because 2 ∈ X has no image in Y.