Set

A set is a well

A set is a well-defined collection of distinct objects. 'Well-defined' means we can clearly identify whether an object belongs to the collection or no

Sets can be represented in two

Sets can be represented in two ways: (1) Roster/Tabular form: listing all elements separated by commas within curly braces, e.g., A = {1, 2, 3, 4, 5}.

Empty/Null Set (∅)

Empty/Null Set (∅): Contains no elements. Singleton Set: Contains exactly one element. Finite Set: Has countable elements or is empty. Infinite Set: H

Union (A ∪ B)

Union (A ∪ B): All elements in A or B or both. Intersection (A ∩ B): Common elements in both A and B. Difference (A - B): Elements in A but not in B.

Pictorial representations of sets using circles

Pictorial representations of sets using circles or ellipses within a rectangle (universal set). They visually show relationships between sets, making