When is the set statement: (A⊕B) = (A ∪ B) true? "When is the set statement:

(A⊕B) = (A ∪ B)

a true statement? Is it true sometimes, never, or always? If it is sometimes, state the cases where it is."
How would you go about finding the answer to the question or ones like this one? 
Thanks for your time!

To add to the previous answers, you might try creating a truth table for or and xor with two bits, then three bits and seeing the results.
The Venn diagram, trying some cases and the other answers should get you going!
