SOLUTION: Prove that for any sets A and B, if A is a subset of B, then Help! Thanks!

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Question 74408: Prove that for any sets A and B, if A is a subset of B, then
Help! Thanks!
Answer by maamarmath(1) About Me  (Show Source):
You can put this solution on YOUR website!
A subset of B so every element of A is an element of B so A(upside-down U)B = A and A U B = B.