1. Does each of the given belong to a group? 2. How were you able to group the given objects? 3. Which of the given belongs to more than one group? 4. How many groups are there? 5. Does each group have the same number of objects or elements? In the activity done, were you able to distinguish characteristics of objects that are common to others? Were you able to describe the differences and similarities between and among objects? Were you able to identify characteristics of objects that makes them fit in the same group? If yes, then you are ready to learn sets. A set is a well-defined collection of objects or things. Example 1. a. The set of students attending college in the University of the Philippines. b. The set of natural numbers 1, 2, 3, and so on. The objects or things that make up a set are called its elements (or members). Sets are usually represented by listing elements, separated by commas with braces (). The symbol E represents an element of a set. Example 2. a. Set A= (4, 6, 10) has elements 4, 6, and 10. 4 E A (read as "4 is an element of A")