# Example 2 - Chapter 14 Class 11 Mathematical Reasoning

Last updated at Dec. 8, 2016 by Teachoo

Last updated at Dec. 8, 2016 by Teachoo

Transcript

Example 2 Write the negation of the following statements. (i)Both the diagonals of a rectangle have the same length. Both Diagonals do not have same length. Or It is false to say that both the diagonals have the same length. Or It is not the case that both the diagonals of a rectangle have the same length . Example 2 Write the negation of the following statements. (ii) 7 is rational. 7 is not rational. or It is false to say that 7 is rational. or It is not the case that 7 is rational.

Writing negation of statements

Chapter 14 Class 11 Mathematical Reasoning

Concept wise

- Statements
- Writing negation of statements
- Negation - Checking if true or not
- Finding Compound Statement
- Words 'And' & 'Or'
- Inclusive and exclusive or
- Quantifiers
- Contrapositive and converse
- If then
- If and only if
- Proving not true/false (by giving counter examples)
- Proving True - If and only if
- Proving True - By Contrapositive
- Proving True - By Contradiction
- Necessary and sufficient condition

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.