If $A$ and $B$ are two sets such that $A \subset B$, then what is $A \cup B ?$
If $A$ and $B$ are two sets such that $A \subset B,$ then $A \cup B=B$
Let $A = \{a, b, c\}, B = \{b, c, d\}, C = \{a, b, d, e\},$ then $A \cap (B \cup C)$ 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
$D-B$
$B-C$
If $X$ and $Y$ are two sets such that $X \cup Y$ has $50$ elements, $X$ has $28$ elements and $Y$ has $32$ elements, how many elements does $X$ $\cap$ $Y$ have?
If $A, B, C$ are three sets, then $A \cap (B \cup C)$ is equal to
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