Question

If $\xi$ = {$a,b,c,d,e,f,g,h$}, $A=$ {$b,c,d,e,f$}, $B=$ {$a,b,c,g,h$} and $C=$ {$c,d,e,f,g$} ,

then find $C$${}^{\prime }$$-B$${}^{\prime }$.

Answer 1

$\xi$ $=\{a,b,c,d,e,f,g,h\}$

$A=\{b,c,d,e,f\}$

$B=\{a,b,c,g,h\}$

$C=\{c,d,e,f,g\}$

$C^{\prime }$ $=\{a,b,h\}$

$B^{\prime }$ $=\{d,e,f\}$

$C^{\prime }$ - $B^{\prime }$ $=\{a,b,h\}-\{d,e,f\}$

$=\{a,b,h\}$