RD Sharma Solutions Class 11 Sets Exercise 1.2

RD Sharma Class 11 Solutions Chapter 1 Ex 1.2 PDF Free Download

Exercise 1.2

Q1:Describe the following sets in Roster form:

(i){x: x is a letter before e in the english alphabet}

(ii){x \(\in\) N: x2 < 25}

(iii) {x \(\in\) N: x is a prime number, 10 < x < 20}

(iv) {x \(\in\) N: x = 2n , n \(\in[\latex] N }

(v) {x \(\in\) R: x > x}

(vi) {x: x is a prime number which is a divisor of 60}

(vii){x: x is a two digit number such that the sum of its digits is 8}

(viii) The set of all letters in the word “Trigonometry”.

(ix)The set of all letters in the word “Better”.

Solution:

(i)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-1

(ii)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-2

(iii)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-3

(iv)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-4

(v)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-5

(vi)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-6

(vii)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-7

(viii)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-8

(ix)

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-9

Q2: Describe the following sets in set-builder form:

(i) A = {1,2,3,4,5,6}

Solution:

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-9

(ii) B = {1,1/2,1/3,1/4,¼,……}

Solution:

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-10

(iii) C = {0,3,6,9,12,……}

Solution:

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-11

(iv) D = {10,11,12,13,14,15}

Solution:

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-12

(v) E = {0}

Solution:

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-13

(vi) {1,4,9,16,…..,100}

Solution:

RD Sharma Solutions Class 11 Chapter 1 Exercise 1.2-14

(vii) {2,4,6,8,…}

Solution:

{x : x = 2n, n \(\in\) N}

(viii) {5, 25, 125, 625}

Solution:

{5n : n \(\in\) N ,1 ≤ n ≤ 4}

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