11. Five marks example problems II

Let \(A = \{1, 2, 3\}\) and \(B = \{4, 5, 6, 7\}\) and \(f = \{(1, 4), (2, 5), (3, 6)\}\) be a function from \(A\) to \(B\). Show that \(f\) is one-to-one but not onto function.