# If $A\cup B=A,\:\:$ then what can you say about $A$ and $B$?

$\begin{array}{1 1} A\subset B \\B\subset A \\ A=B \\ A\:and\:B\; are\; disjoint\; sets. \end{array}$

If $A\cup B=A$ then A is the bigger set and B is within A.
$\Rightarrow B\subset A$
answered May 17, 2013