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Ex 1.4, 3 - Chapter 1 Class 11 Sets
Last updated at August 2, 2026 by Teachoo
Chapter 1 Class 11 Sets
Concept wise
- Depiction and Definition
- Depicition of sets - Roster form
- Depicition of sets - Set builder form
- Intervals
- Null Set
- Finite/Infinite
- Equal sets
- Subset
- Power Set
- Universal Set
-
Venn Diagram and Union of Set
- Intersection of Sets
- Difference of sets
- Complement of set
- Number of elements in set - 2 sets (Direct)
- Number of elements in set - 2 sets - (Using properties)
- Number of elements in set - 3 sets
- Proof - Using properties of sets
- Proof - where properties of sets cant be applied,using element
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Transcript
Ex 1.4, 3 (INTRODUCTION) If A and B are two sets such that A ⊂ B, then what is A ∪ B? Introduction(Example) Let’s take an example A = {1, 2} B = {1, 2, 3} Every element of A is in B. So, A is a subset of B i.e. A ⊂ B. A ∪ B = {1, 2} ∪ {1, 2, 3} = {1, 2, 3} = B Ex 1.4, 3 If A and B are two sets such that A ⊂ B, then what is A ∪ B? If A ⊂ B, then All elements of A are in B. So, A ∪ B = B ∪ Union - Combination of two sets ⊂ Subset - A ⊂ B (all elements of set A in set B)
