Which of the following are sets ? Justify your answer.

A team of eleven best-cricket batsmen of the world.

Which of the following sets are finite or infinite.

$\{1,2,3 \ldots .\}$

Set $A$ has $m$ elements and Set $B$ has $n$ elements. If the total number of subsets of $A$ is $112$ more than the total number of subsets of $B$, then the value of $m \times n$ is

Write the following as intervals :

$\{ x:x \in R, - 12\, < \,x\, < \, - 10\} $

List all the elements of the following sers :

$D = \{ x:x$ is a letter in the word $"\mathrm{LOYAL}" $ $\} $

State which of the following sets are finite or infinite :

$\{ x:x \in N$ and ${x^2} = 4\} $