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SETS-AN INTRODUCTION (Set, Subset, Cardinality of Set, 3 Ways of Describing a Set, Equal and Equivalent Sets, Types of Set) In this lesson, you are expected to: · Define and illustrate well-defined sets, subsets, universal sets, null set, cardinality of sets and other types of sets. · Enumerate the three ways of describing a set · Appreciate the importance of sets in our life.