If $A$ and $B$ are any two sets, then $A \cap (A \cup B)$ is equal to
$A$
$B$
${A^c}$
${B^c}$
Let $A=\{1,2,3,4,5,6\}, B=\{2,4,6,8\} .$ Find $A-B$ and $B-A$
If $A=\{3,6,9,12,15,18,21\}, B=\{4,8,12,16,20\},$ $C=\{2,4,6,8,10,12,14,16\}, D=\{5,10,15,20\} ;$ find
$C-D$
Let $A$ and $B$ be subsets of a set $X$. Then
If $A$ and $B$ are disjoint, then $n(A \cup B)$ is equal to
If $A=\{1,2,3,4\}, B=\{3,4,5,6\}, C=\{5,6,7,8\}$ and $D=\{7,8,9,10\} ;$ find
$B \cup C$