# If A = {3, 6, 9,

A - B shows the relative complement of the set, which represents members of set A which are not part of set B

(i) It is given in the question that,

A = {3, 6, 9, 12, 15, 18, 21}

And, B = {4, 8, 12, 16, 20}

∴ A – B = {3, 6, 9, 12, 15, 18, 21} - {4, 8, 12, 16, 20}

12 is present in both the sets, so A - B will not contain 12 and will contain rest of the elements of A

= {3, 6, 9, 15, 18, 21}

(ii) It is given in the question that,

A = {3, 6, 9, 12, 15, 18, 21}

And, C = {2, 4, 6, 8, 10, 12, 14, 16}

∴ A – C = {3, 6, 9, 12, 15, 18, 21} - {2, 4, 6, 8, 10, 12, 14, 16}

= {3, 9, 15, 18, 21}

(iii) It is given in the question that,

A = {3, 6, 9, 12, 15, 18, 21}

And, D = {5, 10, 15, 20}

∴ A – D = {3, 6, 9, 12, 15, 18, 21} - {5, 10, 15, 20}

= {3, 6, 9, 12, 18, 21}

(iv) It is given in the question that,

B = {4, 8, 12, 16, 20}

And, A = {3, 6, 9, 12, 15, 18, 21}

∴ B – A = {4, 8, 12, 16, 20} - {3, 6, 9, 12, 15, 18, 21}

= {4, 8, 16, 20}

(v) It is given in the question that,

C = {2, 4, 6, 8, 10, 12, 14, 16}

And, A = {3, 6, 9, 12, 15, 18, 21}

∴ C – A = {2, 4, 6, 8, 10, 12, 14, 16} - {3, 6, 9, 12, 15, 18, 21}

= {2, 4, 8, 10, 14, 16}

(vi) It is given in the question that,

D = {5, 10, 15, 20}

And, A = {3, 6, 9, 12, 15, 18, 21}

∴ D – A = {5, 10, 15, 20} - {3, 6, 9, 12, 15, 18, 21}

= {5, 10,20}

(vii) It is given in the question that,

B = {4, 8, 12, 16, 20}

And, C = {2, 4, 6, 8, 10, 12, 14, 16}

∴ B – C = {4, 8, 12, 16, 20} - {2, 4, 6, 8, 10, 12, 14, 16}

= {20}

(viii) It is given in the question that,

B = {4, 8, 12, 16, 20}

And, D = {5, 10, 15, 20}

∴ B – D = {4, 8, 12, 16, 20} - {5, 10, 15, 20}

= {4, 8, 12, 16}

(ix) It is given in the question that,

C = {2, 4, 6, 8, 10, 12, 14, 16}

And, B = {4, 8, 12, 16, 20}

∴ C – B = {2, 4, 6, 8, 10, 12, 14, 16} - {4, 8, 12, 16, 20}

= {2, 6, 10, 14}

(x) It is given in the question that,

D = {5, 10, 15, 20}

And, B = {4, 8, 12, 16, 20}

∴ D – B = {5, 10, 15, 20} - {4, 8, 12, 16, 20}

= {5, 10, 15}

(xi) It is given in the question that,

C = {2, 4, 6, 8, 10, 12, 14, 16}

And, D = {5, 10, 15, 20}

∴ C – D = {2, 4, 6, 8, 10, 12, 14, 16} - {5, 10, 15, 20}

= {2, 4, 6, 8, 12, 14, 16}

(xii) It is given in the question that,

D = {5, 10, 15, 20}

And, C = {2, 4, 6, 8, 10, 12, 14, 16}

∴ D – C = {5, 10, 15, 20} - {2, 4, 6, 8, 10, 12, 14, 16}

= {5, 15, 20}

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