If A = {1, 2, 3, 4}, B{3, 4, 5, 6}, C = {5, 6, 7, 8} and D = {7, 8, 9, 10}; find :
(i) A∪B (ii) A∪C
(iii) B∪C (iv) B∪D
(v) A∪B∪C (vi) A∪B∪D
(vii) B∪C∪D