*According to the latest update on the CBSE Syllabus 2023-24, this chapter has been removed.
The NCERT Solutions for Class 11 Maths Chapter 14 Mathematical Reasoning contain solutions for all Exercise 14.2 questions. This is one of the valuable aids for students to score higher in exams. Students can download the NCERT Solutions of Class 11 Maths and practise offline as well.
NCERT Solutions for Class 11 Maths Chapter 14 Mathematical Reasoning Exercise 14.2
Access Other Exercise Solutions of Class 11 Maths Chapter 14 Mathematical Reasoning
Exercise 14.1 Solutions: 2 Questions (Short Answers)
Exercise 14.3 Solutions: 4 Questions(Short Answers)
Exercise 14.4 Solutions: 4 Questions(Short Answers)
Exercise 14.5 Solutions: 5 Questions(Short Answers)
Miscellaneous Exercise Solutions: 7 Questions (Short Answers)
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NCERT Solutions for Class 11 Maths Chapter 14
Access NCERT Solutions for Class 11 Maths Chapter 14 Exercise 14.2
1. Write the negation of the following statements:
(i) Chennai is the capital of Tamil Nadu.
(ii)Â 
is not a complex number.
(iii) All triangles are not equilateral triangles.
(iv) The number 2 is greater than 7.
(v) Every natural number is an integer.
Solution:
(i) Chennai is not the capital of Tamil Nadu.
(ii)
is a complex number.
(iii) All triangles are equilateral triangles.
(iv) The number 2 is not greater than 7.
(v) Every natural number is not an integer.
2. Are the following pairs of statements negations of each other?
(i) The number x is not a rational number.
The number x is not an irrational number.
(ii) The number x is a rational number.
The number x is an irrational number.
Solution:
(i) The negation of the first statement is ‘the number x is a rational number’.
This is the same as the second statement because if a number is not an irrational number, then the number is a rational number.
Hence, the given statements are negations of each other.
(ii) The negation of the first statement is ‘the number x is not a rational number’. This means that the number x is an irrational number which is the same as the second statement.
Hence, the given statements are negations of each other.
3. Find the component statements of the following compound statements and check whether they are true or false.
(i) Number 3 is prime, or it is odd.
(ii) All integers are positive or negative.
(iii) 100 is divisible by 3, 11 and 5.
Solution:
(i) The component statements are
(a) Number 3 is prime.
(b) Number 3 is odd.
Here, both statements are true.
(ii) The component statements are
(a) All integers are positive.
(b) All integers are negative.
Here, both statements are false.
(iii) The component statements are
(a) 100 is divisible by 3.
(b) 100 is divisible by 11.
(c) 100 is divisible by 5.
Here, the statements (a) and (b) are false, and (c) is true.
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