If $A$ and $B$ are two sets, then $A \cap (A \cup B)'$ is equal to
$A$
$B$
$\phi $
None of these
Draw appropriate Venn diagram for each of the following:
$A^{\prime} \cap B^{\prime}$
Let $U=\{1,2,3,4,5,6,7,8,9\}, A=\{1,2,3,4\}, B=\{2,4,6,8\}$ and $C=\{3,4,5,6\} .$ Find
$(B-C)^{\prime}$
Fill in the blanks to make each of the following a true statement :
$\varnothing^ {\prime}\cap A$
Taking the set of natural numbers as the universal set, write down the complements of the following sets:
$\{ x:x$ is a positive multiple of $3\} $
Let $U=\{1,2,3,4,5,6,7,8,9\}, A=\{1,2,3,4\}, B=\{2,4,6,8\}$ and $C=\{3,4,5,6\} .$ Find
$\left(A^{\prime}\right)^{\prime}$