If A = {1,2,3,4,5},
B= {4,5,6,7,8} and C= {7,8,9,10,11}
Find :
(i) A∪B (ii) A∪C
(iii) B∪C
(i) A = {1,2,3,4,5}
B= {4,5,6,7,8}
So, A∪B = {x:x ϵ A or x ϵ B}
= {1,2,3,4,5,6,7,8}
(ii) A∪C = {x:x ϵ A or x ϵ C}
= {1,2,3,4,5,6,7,8,9,10,11}
(iii) B∪C = {x:x ϵ B or x ϵ C}
= {4,5,6,7,8,9,10,11}