Write the following sets in the set-builder form :

$\{ 2,4,6 \ldots \} $

State whether each of the following set is finite or infinite :

The set of animals living on the earth

Which of the following are sets ? Justify your answer.

A collection of most dangerous animals of the world.

Given the sets $A=\{1,3,5\}, B=\{2,4,6\}$ and $C=\{0,2,4,6,8\},$ which of the following may be considered as universal set $(s)$ for all the three sets $A$, $B$ and $C$

$\{ 1,2,3,4,5,6,7,8\} $

For an integer $n$ let $S_n=\{n+1, n+2, \ldots \ldots, n+18\}$. Which of the following is true for all $n \geq 10$ ?

Examine whether the following statements are true or false :

$\{a\} \subset\{a, b, c\}$