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# *Using the transformation rules of system P, prove the following argument to be valid: (A B) ~C Premise 2. ~(A ~B) Premise...

*Using the transformation rules of system P, prove the following argument to be valid:

1. (A ⊃ B) ⊃ ~C Premise

2. ~(A ≡ ~B) Premise

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/ :. C ⊃ ~Z

*Using the transformation rules of system P, prove the following proposition to be a tautology: