Let $A$ and $B$ be two sets such that $n(A) = 0.16,\,n(B) = 0.14,\,n(A \cup B) = 0.25$. Then $n(A \cap B)$ is equal to
$0.3$
$0.5$
$0.05$
None of these
If $A, B$ and $C$ are three sets such that $A \cap B = A \cap C$ and $A \cup B = A \cup C$ then
If $A$ and $B$ are any two sets, then $A \cap (A \cup B)$ is equal to
$A-(A-B)$ is
Find the intersection of each pair of sets :
$X=\{1,3,5\} Y=\{1,2,3\}$
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
$D-C$