Question: ( a ) Proof. 1 . Assume A - > C and B . 2 . Assume A . 3 . From A and B

(a) Proof. 1. Assume A -> C and B.2. Assume A.3. From A and B, we get A B.(-Intro.)4. Because A and A-> C, we can conclude C (Appl.)5. Since C, we know C.(Dbl. Neg.)6. Since we have A B and C, we know (A B)-> C (Dir. Pf.)

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