Last updated at May 29, 2018 by Teachoo

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Ex 1.3,3 Let A= {1, 2, {3, 4}, 5}. Which of the following statements are incorrect and why? Ex 1.3,3 Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why? (ii) {3, 4} A Let {3, 4} = x A = {1, 2, {3, 4,}, 5} So, A = {1, 2, x, 5} Now, x is in set A So, x A The statement is correct Ex 1.3,3 Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why? (iv) 1 A 1 is an element of A. The statement is correct Ex 1.3,3 Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why? Ex 1.3,3 Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why? (viii) {1, 2, 3} A Here, A = {1, 2, {3, 4,}, 5} Let {3, 4} = x So, A = {1, 2, x, 5} 3 is in {1, 2, 3} but not in A So, {1, 2, 3} is not a subset of A So, the given statement is incorrect. Ex 1.3,3 Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why? (ix) A is not an element of A. (It will be If A= {1, , 2, {3, 4,}, 5} ) The statement is incorrect Ex 1.3,3 Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why?

Chapter 1 Class 11 Sets

Concept wise

- Depiction and Defination
- 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

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.