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
$B-D$
$\{ 4,8,12,16\} $
$B-D=\{4,8,12,16\}$
The shaded region in the given figure is
If $A=\{1,2,3,4\}, B=\{3,4,5,6\}, C=\{5,6,7,8\}$ and $D=\{7,8,9,10\} ;$ find
$A \cup C$
Let $A$ and $B$ be two sets. Then
$A-C$
Let $A$ and $B$ be two sets in the universal set. Then $A – B$ equals
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