Find the union of each of the following pairs of sets :
$A=\{a, e, i, o, u\} B=\{a, b, c\}$
$\{ a\} $
$A \cap B=\{a\}$
If $aN = \{ ax:x \in N\} ,$ then the set $3N \cap 7N$ is …..$N$
$A = \{ x:x$ is a natural number and $1\, < \,x\, \le \,6\} $
$B = \{ x:x$ is a natural number and $6\, < \,x\, < \,10\} $
If $A$ and $B$ are any two sets, then $A \cup (A \cap B) $ is equal to
If $S$ and $T$ are two sets such that $S$ has $21$ elements, $T$ has $32$ elements, and $S$ $\cap \,T$ has $11$ elements, how many elements does $S\, \cup$ $T$ have?
If $A, B$ and $C$ are any three sets, then $A -(B \cup C)$ is equal to
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