If you did not get 6 out of 6 on problem 3 from the exam please redo it and turn in a properly written proof.

Here is the problem:

Let , and be sets. Prove that

Note that you must reason about arbitrary sets — you cannot prove this “by example”. Likewise if you use a truth table then you need to explain why it is relevant and make sure it is a truth table for statements. It makes no sense to say that is true or false if is a set.

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