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NCERT Solutions for Class 11 Maths Chapter 14 Mathematical Reasoning

by aglasem
August 26, 2021
in Extras
Reading Time: 1 min read
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NCERT Solutions

NCERT Solutions Class 11 Maths Chapter 14 Mathematical Reasoning – Here are all the NCERT solutions for Class 11 Maths Chapter 14. This solution contains questions, answers, images, explanations of the complete chapter 14 titled Of Mathematical Reasoning taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Maths, then you must come across chapter 14 Mathematical Reasoning After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Maths Chapter 14 Mathematical Reasoning in one place.

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NCERT Solutions Class 11 Maths Chapter 14 Mathematical Reasoning

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Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Maths for Class 11 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.

For a better understanding of this chapter, you should also see summary of Chapter 14 Mathematical Reasoning , Maths, Class 11.

Class 11
Subject Maths
Book Mathematics
Chapter Number 14
Chapter Name

Mathematical Reasoning

NCERT Solutions Class 11 Maths chapter 14 Mathematical Reasoning

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Class 11, Maths chapter 14, Mathematical Reasoning solutions are given below in PDF format. You can view them online or download PDF file for future use.

Mathematical Reasoning Download

NCERT Solutions for Class 11 Maths Chapter 14 Mathematical Reasoning Download

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Question & Answer

Q.1: Which of the following sentences are statements? Give reasons for your answer. 
(i) There are 35 days in a month. 
(ii) Mathematics is difficult. 
(iii) The sum of 5 and 7 is greater than 10. 
(iv) The square of a number is an even number. 
(v) The sides of a quadrilateral have equal length. 
(vi) Answer this question. 
(vii) The product of (–1) and 8 is 8. 
(viii) The sum of all interior angles of a triangle is 180°. 
(ix) Today is a windy day. 
(x) All real numbers are complex numbers.

Ans : (i) This sentence is incorrect because the maximum number of days in a month is 31. Hence, it is a statement. (ii) This sentence is subjective in the sense that for some people, mathematics can be easy and for some others, it can be difficult. Hence, it is not a statement. (iii) The sum of 5 and 7 is 12, which is greater than 10. Therefore, this sentence is always correct. Hence, it is a statement. (iv) This sentence is sometimes correct and sometimes incorrect. For example, the square of 2 is an even number. However, the square of 3 is an odd number. Hence, it is not a statement. (v) This sentence is sometimes correct and sometimes incorrect. For example, squares and rhombus have sides of equal lengths. However, trapezium and rectangles have sides of unequal lengths. Hence, it is not a statement. (vi) It is an order. Therefore, it is not a statement. (vii) The product of (–1) and 8 is (–8). Therefore, the given sentence is incorrect. Hence, it is a statement. (viii) This sentence is correct and hence, it is a statement. (ix) The day that is being referred to is not evident from the sentence. Hence, it is not a statement. (x) All real numbers can be written as a × 1 + 0 × i. Therefore, the given sentence is always correct. Hence, it is a statement.

Q.2: Give three examples of sentences which are not statements. Give reasons for the answers.

Ans : The three examples of sentences, which are not statements, are as follows. (i) He is a doctor. It is not evident from the sentence as to whom ‘he’ is referred to. Therefore, it is not a statement. (ii) Geometry is difficult. This is not a statement because for some people, geometry can be easy and for some others, it can be difficult. (iii) Where is she going? This is a question, which also contains ‘she’, and it is not evident as to who ‘she’ is. Hence, it is not a statement.

Q.3: Write the negation of the following statements: 
(i) Chennai is the capital of Tamil Nadu. 
(ii) \(\sqrt{2}\) is not a complex number 
(iii) All triangles are not equilateral triangle. 
(iv) The number 2 is greater than 7. 
(v) Every natural number is an integer.

Ans : (i) Chennai is not the capital of Tamil Nadu. (ii) \(\sqrt{2}\) 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.

Q.4: 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.

Ans : (i) The negation of the first statement is “the number x is a rational number”. This is same as the second statement. This is because if a number is not an irrational number, then it is a rational number. Therefore, 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. Therefore, the given statements are negations of each other.

Q.5: 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.

Ans : (i) The component statements are as follows. p: Number 3 is prime. q: Number 3 is odd. Both the statements are true. (ii) The component statements are as follows. p: All integers are positive. q: All integers are negative. Both the statements are false. (iii) The component statements are as follows. p: 100 is divisible by 3. q: 100 is divisible by 11. r: 100 is divisible by 5. Here, the statements, p and q, are false and statement r is true.

NCERT / CBSE Book for Class 11 Maths

You can download the NCERT Book for Class 11 Maths in PDF format for free. Otherwise you can also buy it easily online.

  • Click here for NCERT Book for Class 11 Maths
  • Click here to buy NCERT Book for Class 11 Maths

All NCERT Solutions Class 11

  • NCERT Solutions for Class 11 Accountancy
  • NCERT Solutions for Class 11 Biology
  • NCERT Solutions for Class 11 Chemistry
  • NCERT Solutions for Class 11 Maths
  • NCERT Solutions for Class 11 Economics
  • NCERT Solutions for Class 11 History
  • NCERT Solutions for Class 11 Geography
  • NCERT Solutions for Class 11 Political Science
  • NCERT Solutions for Class 11 Sociology
  • NCERT Solutions for Class 11 Psychology
  • NCERT Solutions for Class 11 English
  • NCERT Solutions for Class 11 Hindi
  • NCERT Solutions for Class 11 Physics
  • NCERT Solutions for Class 11 Business Studies
  • NCERT Solutions for Class 11 Statistics

All NCERT Solutions

You can also check out NCERT Solutions of other classes here. Click on the class number below to go to relevant NCERT Solutions of Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

Class 1 Class 2 Class 3
Class 4 Class 5 Class 6
Class 7 Class 8 Class 9
Class 10 Class 11 Class 12

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