If $A, B$ and $C$ are any three sets, then $A - (B \cap C)$ is equal to
$(A - B) \cup (A - C)$
$(A - B) \cap (A - C)$
$(A - B) \cup C$
$(A - B) \cap C$
If $A=\{1,2,3,4\}, B=\{3,4,5,6\}, C=\{5,6,7,8\}$ and $D=\{7,8,9,10\} ;$ find
$A \cup B$
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
$A-B$
If $A, B, C$ be three sets such that $A \cup B = A \cup C$ and $A \cap B = A \cap C$, then
Find the union of each of the following pairs of sets :
$A=\{1,2,3\}, B=\varnothing$
If $X=\{a, b, c, d\}$ and $Y=\{f, b, d, g\},$ find
$X \cap Y$