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) A-C

(iii) A-D

(iv) B – A

(v) C – A

(vi) D – A

(vii) B – C

(viii) B – D

(ix) C – B

(z) D – B

(xi) C – D

(xii) D – C.

Answer 1

(î) A – B = {3,6,9,15,18,21) 

(ii) A – C = (3,9,15,18,21) 

(iii) A – D = (3,6,9,12,18,21) 

(iv) B – A = {4,8,16,20) 

(v) C – A = {2, 4, 8,10,14,16} 

(vi) D – A = (5,10,20} 

(vii) B – C = {20) 

(viii) B – D = (4,8,12,16) 

(ix) C – B = {2,6,10,14) 

(x) D – B={5,10,15) 

(xi) C – D={2,4,6,812,14,16} 

(xii) D – C={5,15,20).