Question: ( 9 ) 1 . A ~ A 2 . ( ~ A ~ B ) C / ~ A C 1 . A ~

(9)1. A ~ A
2.( ~ A ~ B) C /~ A C
1.A ~ A Premise
2.( ~ A ~ B) C Premise
3. ~ A Contra 1
4.~ A ~ B Taut 3
5. C MP 4,2
6. ~ A C Conj 3,5

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