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# Chapter 1 Sets Ex-1.1 Interview Questions Answers

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Question 1 :
Which of the following are sets? Justify our answer.
(i) The collection of all months of a year beginning with the letter J.
(ii) The collection of ten most talented writers of India.
(iii) A team of eleven best-cricket batsmen of the world.
(iv) The collection of all boys in your class.
(v) The collection of all natural numbers less than 100.
(vi) A collection of novels written by the writer Munshi Prem Chand.
(vii) The collection of all even integers.
(viii) The collection of questions in this Chapter.
(ix) A collection of most dangerous animals of the world.

(i) The collection ofall months of a year beginning with the letter J is a well-defined collectionof objects as one can identify a month which belongs to this collection.

Therefore, thiscollection is a set.

(ii) The collection often most talented writers of India is not a well-defined collection as thecriteria to determine a writer’s talent may differ from one person to another.

Therefore, thiscollection is not a set.

(iii) A team ofeleven best-cricket batsmen of the world is not a well-defined collection asthe criteria to determine a batsman’s talent may vary from one person toanother.

Therefore, thiscollection is not a set.

(iv) Thecollection of all boys in your class is a well-defined collection as you canidentify a boy who belongs to this collection.

Therefore, thiscollection is a set.

(v) Thecollection of all natural numbers less than 100 is a well-defined collection asone can find a number which belongs to this collection.

Therefore, thiscollection is a set.

(vi) A collectionof novels written by the writer Munshi Prem Chand is a well-defined collectionas one can find a book which belongs to this collection.

Therefore, thiscollection is a set.

(vii) Thecollection of all even integers is a well-defined collection as one can find aninteger which belongs to this collection.

Therefore, thiscollection is a set.

(viii) Thecollection of questions in this Chapter is a well-defined collection as one canfind a question which belongs to this chapter.

Therefore, thiscollection is a set.

(ix) A collectionof most dangerous animals of the world is not a well-defined collection as thecriteria to find the dangerousness of an animal can differ from one animal toanother.

Therefore, thiscollection is not a set.

Question 2 :
Let A = {1, 2, 3, 4, 5, 6}. Insert the appropriate symbol ∈or ∉ in the blank spaces:
(i) 5…A (ii) 8…A  (iii) 0…A
(iv) 4…A (v) 2…A (vi) 10…A

(i) 5 ∈ A
(ii) 8 ∉ A
(iii) 0 ∉ A
(iv) 4 ∈ A
(v) 2 ∈ A
(vi) 10 ∉ A

Question 3 :
Write the following sets in roster form:
(i) A = {x: x is an integer and –3 < x < 7}.
(ii) B = {x: x is a natural number less than 6}.
(iii) C = {x: x is a two-digit natural number such that the sum of its digits is 8}
(iv) D = {x: x is a prime number which is divisor of 60}.
(v) E = The set of all letters in the word TRIGONOMETRY.
(vi) F = The set of all letters in the word BETTER.

(i) A = {x: x is an integer and –3 < x < 7}
–2, –1, 0, 1, 2, 3, 4, 5, and 6 only are the elements of this set.
Hence, the given set can be written in roster form as
A = {–2, –1, 0, 1, 2, 3, 4, 5, 6}
(ii) B = {x: x is a natural number less than 6}
1, 2, 3, 4, and 5 only are the elements of this set
Hence, the given set can be written in roster form as
B = {1, 2, 3, 4, 5}
(iii) C = {x: x is a two-digit natural number such that the sum of its digits is 8}
17, 26, 35, 44, 53, 62, 71, and 80 only are the elements of this set
Hence, the given set can be written in roster form as
C = {17, 26, 35, 44, 53, 62, 71, 80}
(iv) D = {x: x is a prime number which is divisor of 60} Here 60 = 2 × 2 × 3 × 5
2, 3 and 5 only are the elements of this set
Hence, the given set can be written in roaster form as
D = {2, 3, 5}
(v) E = The set of all letters in the word TRIGONOMETRY
TRIGONOMETRY is a 12 letters word out of which T, R and O are repeated.
Hence, the given set can be written in roaster form as
E = {T, R, I, G, O, N, M, E, Y}
(vi) F = The set of all letters in the word BETTER
BETTER is a 6 letters word out of which E and T are repeated.
Hence, the given set can be written in roaster form as
F = {B, E, T, R}

Question 4 :
Write the following sets in the set-builder form:
(i) (3, 6, 9, 12)
(ii) {2, 4, 8, 16, 32}
(iii) {5, 25, 125, 625}
(iv) {2, 4, 6 …}
(v) {1, 4, 9 … 100}

(i) {3, 6, 9, 12}

The given set can bewritten in the set-builder form as {x: x = 3n N and 1 ≤ n ≤ 4}

(ii) {2, 4, 8,16, 32}

We know that 2 = 21,4 = 22, 8 = 23, 16 = 24, and 32 = 25.

Therefore, the givenset {2, 4, 8, 16, 32} can be written in the set-builder form as {x: x =2n N and 1 ≤ n ≤ 5}.

(iii) {5, 25,125, 625}

We know that 5 = 51,25 = 52, 125 = 53, and 625 = 54.

Therefore, the givenset {5, 25, 125, 625} can be written in the set-builder form as {x: x =5nN and 1 ≤ n ≤ 4}.

(iv) {2, 4, 6 …}

{2, 4, 6 …} is a setof all even natural numbers

Therefore, the givenset {2, 4, 6 …} can be written in the set-builder form as {x: x isan even natural number}.

(v) {1, 4, 9 …100}

We know that 1 = 12,4 = 22, 9 = 32 …100 = 102.

Therefore, the givenset {1, 4, 9… 100} can be written in the set-builder form as {x: x = n2 N and 1 ≤ n ≤ 10}.

Question 5 :
List all the elements of the following sets:
(i) A = {x: x is an odd natural number}
(ii) B = {x: x is an integer, -1/2 < x < 9/2}
(iii) C = {x: x is an integer, x2 ≤ 4}
(iv) D = {x: x is a letter in the word “LOYAL”}
(v) E = {x: x is a month of a year not having 31 days}
(vi) F = {x: x is a consonant in the English alphabet which proceeds k}.

(i) A = {xx isan odd natural number}

So the elements are A= {1, 3, 5, 7, 9 …..}

(ii) B = {xx isan integer, -1/2 < x < 9/2}

We know that – 1/2 = –0.5 and 9/2 = 4.5

So the elements are B= {0, 1, 2, 3, 4}.

(iii) C = {xx isan integer, x2 ≤ 4}

We know that

(–1)2 =1 ≤ 4; (–2)2 = 4 ≤ 4; (–3)2 = 9 > 4

Here

02 = 0≤ 4, 12 = 1 ≤ 4, 22 = 4 ≤ 4, 32 =9 > 4

So we get

C = {–2, –1, 0, 1, 2}

(iv) D = {xx isa letter in the word “LOYAL”}

So the elements are D= {L, O, Y, A}

(v) E = {xx isa month of a year not having 31 days}

So the elements are E= {February, April, June, September, November}

(vi) F = {xx isa consonant in the English alphabet which proceeds k}

So the elements are F= {b, c, d, f, g, h, j}

Question 6 :
Match each of the set on the left in the roster form with the same set on the right described in set-builder form:
(i) {1, 2, 3, 6} (a) {x: x is a prime number and a divisor of 6}
(ii) {2, 3} (b) {x: x is an odd natural number less than 10}
(iii) {M, A, T, H, E, I, C, S} (c) {x: x is a natural number and divisor of 6}
(iv) {1, 3, 5, 7, 9} (d) {x: x is a letter of the word MATHEMATICS}

(i) Here the elements of this set are natural number as well as divisors of 6. Hence, (i) matches with (c).
(ii) 2 and 3 are prime numbers which are divisors of 6. Hence, (ii) matches with (a).
(iii) The elements are the letters of the word MATHEMATICS. Hence, (iii) matches with (d).
(iv) The elements are odd natural numbers which are less than 10. Hence, (v) matches with (b).

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