Which of the following sets are empty sets? Justify your answer.
(i) `A={x : x^(2)=4 and 3x=9}`
(ii) The set of all triangles in a plane having the sum of their three angles less than 180.

Which of the following are sets ? Justify your answer. The collection of all even integers.

Which of the following are sets ? Justify your answer. The collection of all boys in your class.

Which of the following are sets ? Justify your answer. The collection of questions in this Chapter.

Which of the following are sets ? Justify your answer. A collection of most dangerous animals of the world.

Which of the following are empty sets? Justify your answer. (i) Set of integer which lie between 2 and 3. (ii) Set of natural numbers that are smaller than 1. (iii) Set of odd numbers that leave remainder zero, when divided by 2.

Which of the following are sets ? Justify your answer. The collection of ten most talented writers of India.

Which of the following are sets ? Justify your answer. The collection of all natural numbers less than 100.

Which of the following sentences are statements? Give reasons for your answer The sum of all interior angles of a triangle is 180^(@) .

Which of the following are sets ? Justify your answer. A team of eleven best-cricket batsmen of the world.

Which of the following are sets ? Justify your answer. The collection of all the months of a year beginning with the letter J.