Question

4. Write each of the following sets in set-builder form:
(i) A = {4, 6, 8, 9, 10, 12, 14, 15, 16, 18).
(ii) B = {1, 2, 3, 5, 6, 10, 15, 30).
(iii) C = (-9, -6, -3, 0, 3, 6, 9, 12, 15).
.
1 2 3 8
(iv) D=
2 3 4
1 1 1 1 1 1 1
(U) E =
3'5'7' 11' 13' 17' 19
'
(vi) F = (April, June, September, November).
(vii) G = (0)
(viii) H= {).
19​

Answer 1

Answer:

(i) {x : x is an even natural numbers less than 12}

(ii) {x : x is a prime numbers less than 12}

(iii) {x : x is a month whose name starts with letter J}

(iv) { x : x is a vowel in English alphabets}

(v) {x : x is a day of the week whose name starts with letter T}

(vi) {x : x is a perfect square natural number upto 25}

(vii) {x : x is a natural number upto 30 and divisible by 5}

2. (i) A = {x | x is an odd number less than 10}.

(ii) B = {x | x is a perfect square natural number between 15 and 65}

(iii) C = {x | x is a vowel in English small alphabet}.

(iv) D = {x | x is a color in rainbow}.

(v) E = {x | x is a month having 31 days}.

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