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 sets are null sets? C={ x: x in W and -3 lt x lt -2 },

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.

If A= {x:x^2=9 and 2x=3} then find set A

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

Which of the following sets are null sets? D={ x:x is a prime number and 6 lt x lt 8 }.

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