If ${N_a} = [an:n \in N\} ,$ then ${N_5} \cap {N_7} = $
${N_7}$
$N$
${N_{35}}$
${N_5}$
If $A, B$ and $C$ are any three sets, then $A - (B \cap C)$ is equal to
Let $A =\{1,2,3,4,5,6,7\}$ and $B =\{3,6,7,9\}$. Then the number of elements in the set $\{ C \subseteq A : C \cap B \neq \phi\}$ is
Find the union of each of the following pairs of sets :
$A = \{ x:x$ is a natural number and multiple of $3\} $
$B = \{ x:x$ is a natural number less than $6\} $
If $A=\{3,5,7,9,11\}, B=\{7,9,11,13\}, C=\{11,13,15\}$ and $D=\{15,17\} ;$ find
$\left( {A \cap B} \right) \cap \left( {B \cup C} \right)$
The shaded region in the given figure is