One way to describe a function is as the relationship between two sets. Every single thing in set 1 has a connection to something in set 2. If "f" is a function between two sets, X and Y, then every element in set X is the image of set Y. The functions that students will learn in RS Aggarwal Class 12 Chapter 1 Solution are listed below. One to One function. One to Many functions. Onto functions. One to one Correspondence.