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

Which of the following are sets? Justify your answer.
(i) The collection of all the 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.

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}

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 }