Question

If A = {3, 6, 12, 15, 18, 21}, B = {4, 8, 12, 16, 20}, C = {2, 4, 6, 8, 10, 12, 14, 16} and D = {5, 10, 15, 20}, find: (i) A u B (ii) A u C (iii) A u D (iv) B u C (v) B u D (vi) C u D​

Answer 1

Answer:

AuB={12}

AuC={6,12}

BuC={4,8,12,16}

BuD={20}

CuD={10}

Answer 2

Answer:

i. A u B = {3,4,6,12,15,16,18,20,21}

ii. A u C = {2,3,4,6,8,10,12,14,15,16,18,21}

iii. A u D = {3,5,6,10,12,15,18,20,21}

iv. B u C = {2,4,6,8,10,12,14,16}

v. B u D = {4,5,8,10,12,15,16,20}

vi. C u D = {2,4,5,6,8,10,12,14,15,16,20}