Question

If $A=\{3,6,9,12,15,18,21\};B=\{4,8,12,16,20\}$
$C=\{2,4,6,8,10,12,14,16\};D=\{5,10,15,20\}$; find
(i) $A-B$ (ii) $B-A$ (iii) $C-A$ (iv) $D-A$
(v) $B-C$ (vi) $B-D$ (vii) $C-B$ (viii) $D-B$

Answer 1

(i) $A-B=\{3,6,9,15,18,21\}$

(ii) $B-A=\{4,8,16,20\}$

(iii) $C-A=\{2,4,8,10,14,16\}$

(iv) $D-A=\{5,10,20\}$

(v) $B-C=\left\{20\right\}$

(vi) $B-D=\{4,8,12,16\}$

(vii) $C-B=\{2,6,10,14\}$

(viii) $D-B=\{5,10,15\}$