Which of the following are sets ? Justify your answer.
The collection of ten most talented writers of India.
List all the elements of the following sers :
$A = \{ x:x$ is an odd natural number $\} $
Which of the following are sets ? Justify your answer.
A collection of most dangerous animals of the world.
Which of the following are examples of the null set
Set of even prime numbers
Let $S=\{1,2,3,4\}$. The total number of unordered pairs of disjoint subsets of $S$ is equal to