If $A = \{1, 2, 3, 4, 5\}, B = \{2, 4, 6\}, C = \{3, 4, 6\},$ then $(A \cup B) \cap C$ is
$\{3, 4, 6\}$
$\{1, 2, 3\}$
$\{1, 4, 3\}$
None of these
If $A$ and $B$ are any two sets, then $A \cup (A \cap B) $ is equal to
If $A, B$ and $C$ are any three sets, then $A - (B \cap C)$ is equal to
If $X=\{a, b, c, d\}$ and $Y=\{f, b, d, g\},$ find
$X-Y$
Find the union of each of the following pairs of sets :
$A=\{1,2,3\}, B=\varnothing$
If $A=\{3,5,7,9,11\}, B=\{7,9,11,13\}, C=\{11,13,15\}$ and $D=\{15,17\} ;$ find
$A \cap C \cap D$