Question: For each numbered statement that is not a premise in each of the formal proofs that follow, state the rule of inference that justifies it.

For each numbered statement that is not a premise in each of the formal proofs that follow, state the rule of inference that justifies it.


1. A ⊃ B
2. C ⊃ ~ B
∴ A ⊃ ~ C

3. ~~ B ⊃ ~ C

4. B ⊃ ~ C

5. A ⊃ ~ C

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