### Part - 1

00:00:01 Introduction to Lecture 3

00:01:32 Union operation on sets

00:04:42 Properties of Union (Associative, Commutative, Law of phi, Law of U, Idempotent Law)

00:15:22 NCERT Exercise 1.4 Question 4

00:19:02 Definition of Union in set builder form

00:20:42 NCERT Exercise 1.4 Question 1

00:28:02 NCERT Exercise 1.4 Question 2

00:29:42 NCERT Exercise 1.4 Question 3

00:30:52 Intersection operation on sets

00:32:52 Properties of Intersection (Associative, Commutative, Law of phi, Law of U, Idempotent Law)

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00:38:52 NCERT Exercise 1.4 Question 6

00:45:52 Definition of intersection in set builder form

00:47:42 NCERT Exercise 1.4 Question 5

00:50:52 NCERT Exercise 1.4 Question 7

00:55:52 Disjoint Sets

00:56:52 NCERT Exercise 1.4 Question 8

00:58:00 NCERT Exercise 1.4 Question 12

00:59:12 Subtraction operation on sets

01:02:42 NCERT Exercise 1.4 Question 10

01:04:40 NCERT Exercise 1.4 Question 9

01:10:05 NCERT Exercise 1.4 Question 11

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