If a set $A$ has $n$ elements, then the total number of subsets of $A$ is

- A
$n$

- B
${n^2}$

- C
${2^n}$

- D
$2n$

Make correct statements by filling in the symbols $\subset$ or $ \not\subset $ in the blank spaces:

$\{ x:x$ is a circlein the plane $\} \ldots \{ x:x$ is a circle in thesame plane with radius $1$ unit $\} $

The number of non-empty subsets of the set $\{1, 2, 3, 4\}$ is

Write the following sets in roster form :

$B = \{ x:x$ is a natural number less than ${\rm{ }}6\} $

Let $S=\{1,2,3,4\}$. The total number of unordered pairs of disjoint subsets of $S$ is equal to

- [IIT 2010]

Consider the sets

$\phi, A=\{1,3\}, B=\{1,5,9\}, C=\{1,3,5,7,9\}$

Insert the symbol $\subset$ or $ \not\subset $ between each of the following pair of sets:

$A, \ldots B$