Question: 2. Set Proof (5 points) Let X and Y be sets. a)(4 points) Prove a E XUY ? a EX b) (1 point) Is it

2. Set Proof (5 points) Let X and Y be sets.

2. Set Proof (5 points) Let X and Y be sets. a)(4 points) Prove a E XUY ? a EX b) (1 point) Is it also the case that a E X ? a 7

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