If $A$ and $B$ are sets, then $A \cap (B -A)$ is
$\phi $
$A$
$B$
None of these
(a) $A \cap (B – A) = \phi $, $[\because x \in B – A \Rightarrow x\not \in A]$.
Find the intersection of each pair of sets :
$X=\{1,3,5\} Y=\{1,2,3\}$
If $A$ and $B$ are two sets such that $A \subset B$, then what is $A \cup B ?$
If $A, B$ and $C$ are non-empty sets, then $(A -B) \cup (B -A)$ equals
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 $A=\{1,2,3,4\}, B=\{3,4,5,6\}, C=\{5,6,7,8\}$ and $D=\{7,8,9,10\} ;$ find
$B \cup C \cup D$
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