If $A, B$ and $C$ are non-empty sets, then $(A -B) \cup (B -A)$ equals
$(A \cup B) -B$
$A -(A \cap B)$
$(A \cup B) -(A \cap B)$
$(A \cap B) \cup (A \cup B)$
Given the sets $A = \{ 1,\,2,\,3\} ,\,B = \{ 3,4\} , C = \{4, 5, 6\}$, then $A \cup (B \cap C)$ is
Find the union of each of the following pairs of sets :
$X =\{1,3,5\} \quad Y =\{1,2,3\}$
If $A=\{1,2,3,4\}, B=\{3,4,5,6\}, C=\{5,6,7,8\}$ and $D=\{7,8,9,10\} ;$ find
$B \cup D$
If $X$ and $Y$ are two sets such that $n( X )=17, n( Y )=23$ and $n( X \cup Y )=38$
find $n( X \cap Y )$
If $A$ and $B$ are any two sets, then $A \cap (A \cup B)$ is equal to