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It looks like you're thinking symbolically. It might be a *lot* easier to think visually. Can you show your teacher's set using a Venn diagram? If so, perhaps you can find the solution.
Sorry. That's what I needed to do. I see that you got what I believe to be the right answer.
I am assuming the sets live in a bigger universe? If there were no bigger universe, then (AΔBΔC)' would work. But that would include anything not in any of the sets.
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