Ex 1.4, 3 - Chapter 1 Class 11 Sets

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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)