Cardinal Numbers of Sets | Important Formulae + Venn Diagram Approach |Class 11 Maths #class11maths

Welcome to Part 4 of our Class 11 Sets Chapter series! In this video, we explore one of the most important and scoring topics in set theory — Cardinal Number of Sets. This topic is often used in Venn Diagram problems, word problems, and competitive exams, so understanding these formulae and results is a must!

Through clear explanations, visual examples, and practice questions, you’ll master how to apply cardinal number results confidently in any question.

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🔹 What You’ll Learn in This Lecture:
✔ What is Cardinal Number of a Set
✔ Basic Formulas:
• n(A ∪ B) = n(A) + n(B) – n(A ∩ B)
• For three sets: n(A ∪ B ∪ C) = … (explained in detail)
✔ How to apply these formulas using Venn Diagrams
✔ Solving real-life problems based on cardinal numbers
✔ Tricks to avoid common mistakes
✔ Practice Questions with Step-by-Step Solutions
🎯 Why Watch This Video?
✅ Complete coverage of all important formulas from this topic
✅ Visual illustrations using Venn diagrams for better clarity
✅ Aligned with CBSE Class 11 & NCERT syllabus
✅ Helpful for JEE, NEET, and other entrance exams
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