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# Let A = {a, e, i, o, u} and B = {a, i, u}. Show that A $\cup$ B = A

We have, A $\cup$ B = {a, e, i, o, u} = A.
This example illustrates that union of sets A and its subset B is the set A itself, i.e., if B $\subset$ A, then
A $\cup$ B = A.