Question

Q.4: Write the given sets in set-builder form: (a). {4, 8, 12, 16, 20} (b). {3, 9, 27, 81} (c). {4, 16, 64, 256, 1024} (d). {1, 3, 5, 7…} (e). {1, 8, 27, 64….1000} No spam

Answer 1

Answer:

B={9,16,25,36,.....,81}. The given no. are square of natural numbers from 3 to 9. Therefore,. B={x:x=n2;n∈N,3≤n≤9}.

Answer 2

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}