List all the elements of the following sets:
(i) A = { X:X is an odd natural number }

(ii) B = { X:X is an integer,- < X < }

(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 precedes k }

Write the following sets in roster form:
(i) A = {: is an integer and –3<<7}
(ii) B = {: is a natural number less than 6}
(iii) C = {: is a two-digit natural number such that the sum of its digits is 8}
(iv) D = {: is a prime number which is the 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

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

Match each of the sets on the left described 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) {H, A, Y, R, N}           (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 'HARYANA'.}

Which of the following are examples of the null set?
(i) Set of odd natural numbers divisible by 2.

(ii) Set of even prime numbers.

(iii) { x : x is a natural number, x < 5 and simultaneously x > 7 }

(iv) { y : y is a point common to any parallel lines }