Question

Let $A=\{a,b,c,d\}andB=\{b,d,f,g\}$. Find $A\Delta B$

Answer 1

We have
$(A-B)=\{a,b,c,d\}-\{b,d,f,g\}=\{a,c\}$.

$(B-A)=\{b,d,f,g\}-\{a,b,c,d\}=\{f,g\}$

$\therefore A\Delta B=(A-B)\cup (B-A)=\{a,c\}\cup \{f,g\}=\{a,c,f,g\}$