Which of the following are sets ? Justify your answer.
The collection of ten most talented writers of India.
Which of the following sets are finite or infinite.
$\{1,2,3 \ldots .\}$
Write the following intervals in set-builder form :
$\left[ { - 23,5} \right)$
The number of elements in the set $\{ (a,\,b):2{a^2} + 3{b^2} = 35,\;a,\,b \in Z\} $, where $Z$ is the set of all integers, is
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and $x$ is prime $\} $