The mapping f : N $$\to$$ N given by f(n) = 1 + n², n $$\in$$ N where N is the set of natural numbers, is

A function f : A $$\to$$ B, where A = {x/$$-$$1 $$\le$$ x $$\le$$ 1} and B = {y/1 $$\le$$ y $$\le$$ 2} is defined by the rule y = f(x) = 1 + x². Which of the following statement is then true?

Let A = {1, 2, 3} and B = {2, 3, 4}, then which of the following relations is a function from A to B?

For any two sets A and B, A $$-$$ (A $$-$$ B) equals