Finite set, Infinite set, Singleton set - Practice Questions & MCQ

Finite set: A set that is empty or consists of a finite number of elements is called a finite se
Examples: $\varphi,\{\mathrm{a}\},\{1,2,5,9\},\{\mathrm{x}: \mathrm{x}$ is a person of age more than 18$\}$
Infinite set: A set that has infinite elements is called an infinite set.
Examples:
a set of all the lines passing through a point,
set of all circles in a plane,
set of all points in a plane,
$N, Z, Q, Q ', R$
$\{x: 2<x<2.1\}$
Singleton set: A set which is having only one element is called a singleton set.
Example: $\{3\},\{b\}$,
$\{\{1,2,3\}\}$ is also singleton as it has one element which is a set
$\{\varphi\}$ is also a singleton set
Note: Empty and singleton sets are finite sets