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  • 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 (x) D – B (xi) C–D (xii) D–C

Q9. 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       (x) D – B            (xi) C – D            (xii) D – C

Answers (1)

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 }

The given operations are done as follows

(i) A – B  = {3,6,9,15,18,21}                                    (vii) B – C = {20}

(ii) A – C = {3,9,15,18,21}                                       (viii) B – D =  {4,8,12,16}     

(iii) A – D = {3,6,9,12,18,21}                                    (ix) C – B  = {2,6,10,14} 

(iv) B – A = {4,8,16,20}                                            (x) D – B   = {5,10,15}

(v) C – A = {2,4,8,10,14,16}                                     (xi) C – D  = {2,4,6,8,12,14,16}

(vi) D – A = {5,10,20}                                               (xii) D – C = {5,15,20}

 

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