If ${N_a} = [an:n \in N\} ,$ then ${N_5} \cap {N_7} = $
${N_7}$
$N$
${N_{35}}$
${N_5}$
(c) ${N_5} \cap {N_7} = {N_{35}}$,
[$\because 5$ and $7$ are relatively prime numbers].
If $A$ and $B$ are two sets, then $A \cup B = A \cap B$ iff
If $A=\{3,5,7,9,11\}, B=\{7,9,11,13\}, C=\{11,13,15\}$ and $D=\{15,17\} ;$ find
$A \cap C \cap D$
If $A$ and $B$ are any two sets, then $A \cup (A \cap B) $ is equal to
$A-(A-B)$ is
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
$C-B$
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