Last updated at Jan. 27, 2020 by Teachoo

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Ex 1.4, 1 Find the union of each of the following pairs of sets: (i) X = {1, 3, 5} Y = {1, 2, 3} X ∪ Y = {1, 3, 5} ∪ {1, 2, 3} = {1, 2, 3, 5} ∪ Union - Combination of two sets Ex 1.4, 1 Find the union of each of the following pairs of sets: (ii) A = {a, e, i, o, u} B = {a, b, c} A ∪ B = {a, e, i, o, u} ∪ {a, b, c} = {a, b, c, e, i, o, u} ∪ Union - Combination of two sets Ex 1.4, 1 Find the union of each of the following pairs of sets: (iii) A = {x: x is a natural number and multiple of 3} B = {x: x is a natural number less than 6} Natural number = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,… A = {x: x is a natural number and multiple of 3} Multiple of 3 = 3, 6, 9, 12, 15… A = {3, 6, 9 …} B = {x: x is a natural number less than 6} B = {1, 2, 3, 4, 5} ∪ Union - Combination of two sets A ∪ B = {3, 6, 9 …} ∪ {1, 2, 3, 4, 5} = {1, 2, 4, 5, 3, 6, 9, 12 …} A ∪ B = {x: x is a natural number, x = 1, 2, 4, 5 or a multiple of 3} Ex 1.4, 1 Find the union of each of the following pairs of sets: (iv) A = {x: x is a natural number and 1 < x ≤ 6} B = {x: x is a natural number and 6 < x < 10} Natural numbers = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,… A = {x: x is a natural number and 1 < x ≤ 6} = {2, 3, 4, 5, 6} B = {x: x is a natural number and 6 < x< 10} = {7, 8, 9} ∪ Union - Combination of two sets A ∪ B = {2, 3, 4, 5, 6} ∪ {7, 8, 9} = {2, 3, 4, 5, 6, 7, 8, 9} ∴ A ∪ B = {x: x ∈ N and 1 < x < 10} Ex 1.4, 1 Find the union of each of the following pairs of sets: (v) A = {1, 2, 3}, B = ∅ Given A = {1, 2, 3}, B = ∅ = {} A ∪ B = {1, 2, 3} ∪ {} = {1, 2, 3} ∪ Union - Combination of two sets

Ex 1.4

Ex 1.4, 1
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Ex 1.4, 2

Ex 1.4, 3 Important

Ex 1.4, 4 Important

Ex 1.4, 5 Important

Ex 1.4, 6

Ex 1.4, 7

Ex 1.4, 8

Ex 1.4, 9 Important Deleted for CBSE Board 2022 Exams

Ex 1.4, 10 (i) Deleted for CBSE Board 2022 Exams

Ex 1.4,10 (ii) Deleted for CBSE Board 2022 Exams

Ex 1.4, 10 (iii)

Ex 1.4, 11 Deleted for CBSE Board 2022 Exams

Ex 1.4, 12 Important

Chapter 1 Class 11 Sets (Term 1)

Serial order wise

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.