Question

If $A=\{p,q,r,s\}$, $B=\{r,s,t,u\}$, then $A/B$ is:

• A. { p, q }
• B. { r, s }
• C. { t, u }
• D. {p, q, t, u }

Answer 1

The correct option is A { p, q }

The given sets are $A=\{p,q,r,s\}$ and$B=\{r,s,t,u\}$

$A/setminusB$ have those elements that belongs to set $A$ but does not belongs to set $B$.

Let us find $A/setminusB$ as follows:

$AsetminusB=\{p,q,r,s\}/setminus\{r,s,t,u\}=\{p,q\}$

Hence, $A/setminusB=\{p,q\}$