RD Sharma Class 11 Solutions Chapter 31 Exercise 31.2 (Updated for 2021-22) RD Sharma Solutions Class 11 Maths Chapter 31 Exercise 31.2: In this exercise, we’ll look at the concept of negation in relation to a statement. The solutions are created by Kopykitab’s experts who have extensive experience in the field of education. The primary goal of providing RD Sharma Class 11 Solutions is to assist students, regardless of their intellect level. The solutions are written in simple language to assist students grasp the concepts and perform well on the yearly exam. Students can get RD Sharma Solutions Class 11 Maths Chapter 31 Exercise 31.2 by clicking on the links below and practising offline.

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RD Sharma Solutions Class 11 Maths Chapter 31 Exercise 31.2

Access answers to RD Sharma Solutions Class 11 Maths Chapter 31 Exercise 31.2- Important Question with Answers

1. Write the negation of the following statement:
(i) Bangalore is the capital of Karnataka.

(ii) It rained on July 4, 2005.

(iii) Ravish is honest.

(iv) The earth is round.

(v) The sun is cold.

Solution:

(i) Bangalore is the capital of Karnataka.

The negation of the statement is:

It is false that “Bangalore is the capital of Karnataka.”

Or

“Bangalore is not the capital of Karnataka.”

(ii) It rained on July 4, 2005.

The negation of the statement is:

It is false that “It rained on July 4, 2005”.

Or

“It did not rain on July 4, 2005”.

(iii) Ravish is honest.

The negation of the statement is:

It is false that “Ravish is honest.”

Or

“Ravish is not honest.”

(iv) The earth is round.

The negation of the statement is:

It is false that “The earth is round.”

Or

“The earth is not round.”

(v) The sun is cold.

The negation of the statement is:

It is false that “The sun is cold.”

Or

“The sun is not cold.”

2. (i) All birds sing.

(ii) Some even integers are prime.

(iii) There is a complex number that is not a real number.

(iv) I will not go to school.

(v) Both the diagonals of a rectangle have the same length.

(vi) All policemen are thieves.

Solution:

(i) All birds sing.

The negation of the statement is:

It is false that “All birds sing.”

Or

“All birds do not sing.”

(ii) Some even integers are prime.

The negation of the statement is:

It is false that “even integers are prime.”

Or

“Not every even integer is prime.”

(iii) There is a complex number that is not a real number.

The negation of the statement is:

It is false that “complex numbers are not a real number.”

Or

“All complex numbers are real numbers.”

(iv) I will not go to school.

The negation of the statement is:

“I will go to school.”

(v) Both the diagonals of a rectangle have the same length.

The negation of the statement is:

“There is at least one rectangle whose both diagonals do not have the same length.”

(vi) All policemen are thieves.

The negation of the statement is:

“No policemen are thieves”.

3. Are the following pairs of statements are a negation 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 not a rational number.
The number x is an irrational number.

Solution:

(i) The number x is not a rational number.

“The number x is an irrational number.”

Since the statement “The number x is not a rational number.” Is a negation of the first statement.

(ii) The number x is not a rational number.

“The number x is an irrational number.”

Since the statement “The number x is a rational number.” Is not a negation of the first statement.

4. Write the negation of the following statements:

(i) p: For every positive real number x, the number (x – 1) is also positive.

(ii) q: For every real number x, either x > 1 or x < 1.

(iii) r: There exists a number x such that 0 < x < 1.

Solution:

(i) p : For every positive real number x, the number (x – 1) is also positive.

The negation of the statement:

p: For every positive real number x, the number (x – 1) is also positive.

is

~p: There exists a positive real number x, such that the number (x – 1) is not positive.

(ii) q:For every real number x, either x > 1 or x < 1.

The negation of the statement:

q: For every real number x, either x > 1 or x < 1.

is

~q: There exists a real number such that neither x>1 nor x<1.

(iii) r: There exists a number x such that 0 < x < 1.

The negation of the statement:

r: There exists a number x such that 0 < x < 1.

is

~r: For every real number x, either x ≤ 0 or x ≥ 1.

5. Check whether the following pair of statements is a negation of each other. Give reasons for your answer.

(i) a + b = b + a is true for every real number a and b.
(ii) There exist real numbers a and b for which a + b = b + a.

Solution:

The negation of the statement:

p: a + b = b + a is a true for every real number a and b.

is

~p: There exist real numbers are ‘a’ and ‘b’ for which a+b ≠ b+a.

So, the given statement is not the negation of the first statement.

We have provided complete details of RD Sharma Solutions Class 11 Maths Chapter 31 Exercise 31.2. If you have any queries related to CBSE Class 11, feel free to ask us in the comment section below.

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There are a total of 5 questions in RD Sharma Solutions Class 11 Maths Chapter 31 Exercise 31.2.

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