Question

Let $A$ and $B$ be two sets such that $A\cup B=A$, then $A\cap B$ is equal to

• A. $\varphi$
• B. $B$
• C. $A$
• D. $A\cup B$

Answer 1

Answer: (B)

$B$

Since $A\cup B=A\Rightarrow B\subset A\therefore A\cap B=B$