Question

If $A\cap B=\varphi$, then $A\Delta B$ =

• A. $A\cap B$
• B. $A\cup B$
• C. $A-B$
• D. $B-A$

Answer 1

Answer: (B)

$A\cup B$

We know that $A\Delta B=A\cup B-A\cap B$

Given $A\cap B=\varphi$

$\therefore A\Delta B=A\cup B-\varphi =A\cup B$

Hence, the answer is $A\cup B$.