P: not C → AP: D → not B P: ?C: D → A

nimakian801 September 26, 2019

There is a mistake in this question.

The answer is correct however the steps shown are incorrect. The contrapositive of not B - > not C is C - >B. The question says it is B - >C.

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nimakian801 September 26, 2019

I mean otherwise the answer would be D.