Write down all the subsets of the following sets

$\{ a\} $

Let $A=\{a, e, i, o, u\}$ and $B=\{a, i, u\} .$ Show that $A \cup B=A$

In the following state whether $A=B$ or not :

$A=\{a, b, c, d\} ; B=\{d, c, b, a\}$

Write down all the subsets of the following sets

$\emptyset $

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

Write the following as intervals :

$\{ x:x \in R,0\, \le \,x\, < \,7\} $