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 n...........

 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       (3 marks)

(i) A – B

(ii) A – C

(iii) A – D

(iv) B – A

(v) C – A

(vi) D – A

(vii) B – C

(viii) B – D

(ix) C – B

(x) D – B

(xi) C – D

(xii) D – C