please help me solve the following proofs with the methods mentioned above each of them. #1. Prove
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Question:
please help me solve the following proofs with the methods mentioned above each of them.
#1. Prove by reduction to absurdity that
A ⊆ B and C' ⊆ B' , then A ⊆ C
#2. Prove by contraposition that
B' ⊆ ( A ∩ B)'
#3. Prove using universal proof that
( A ∩ B) ⊆ (A ∪ B)
(this is for a logic course, not a math course, if that changes anything)
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