Explanation: Statement:1. All relations are functions but all functions are not relations. All functions are relations, but not all relations are functions. A function is a relation that for each input, there is only one output. [ alt="F1 Sachin K 20-1-22 Savita D6" src="//storage.googleapis.com/tb-img/production/22/01/F1_Sachin%20K_20-1-22_Savita_D6.png" style="width: 145px; height: 145px;"> So, statement 1 is incorrect. Statement: 2. A relation from A to B is a subset of Cartesian product A × B. If A and B are set, the Cartesian product of A and B is the set A × B = {(a, b) : (a ∈ A) and (b ∈ B)}. Every relation is a subset of the Cartesian product So, statement 2 is correct. Statement: 3. A relation in A is a subset of Cartesian product A × A. A relation from a non-empty set A to a non-empty set A is a subset of cartesian product A × A. The first element is called the preimage of the second and the second element is called the image of the first. So, statement 3 is correct.