Question

Let A = { a, e, i, o, u } and B = { a, i, u }. Show that A ∪ B = A

Let X = {Ram, Geeta, Akbar} be the set of students of Class XI, who are in school hockey team. Let Y = {Geeta, David, Ashok} be the set of students from Class XI who are in the school football team. Find X ∪ Y and interpret the set.