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Elsa on September 16, 2019


Hello :) While doing both sets of drills, I noticed that I keep getting it thee answers wrong because I am answering with the contrapositives. Is there a step that I am missing? or do you have any advice on what I can do to avoid this in the future?

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Irina on September 27, 2019


I do not think it is an issue, as long as you are comfortable with the rules of inference, contrapositive is an equally valid answer. Could you point to a specific drill question that you have gotten wrong?