Question

A function from set \(A\) to set \(B\) is a relation in which:

Options

• every element of \(B\) must be an image

• every element of \(B\) has exactly one image in \(A\)

• every element of \(A\) has more than one image in \(B\)

• every element of \(A\) has exactly one image in \(B\)

Answer 1

A function assigns exactly one image in \(B\) to every element of \(A\). It is therefore a special kind of relation from \(A\) to \(B\).