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Posted by **Laurey** on Friday, February 4, 2011 at 10:10am.

What can you say about the sets A and B if we know that:

1. A ∪ B = A

2. A ∩ B = A

Thanks for any helpful replies :)

- Discrete Math -
**MathMate**, Friday, February 4, 2011 at 3:03pm1. A∪B = A

=> x∈B -> x∈A

=> B⊆A

2. A∩B = A

=> x∈A -> x∈B

=> A⊆B

Now

B⊆A ∧ A⊆B

means what?

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