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Conditional sentences.docx

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Dc Mc

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Conditional sentences: If P then Q a valid argument. - If P, then Q. A conditional. If antecedent, then consequent. A conditional is true if the truth of its antecedent is sufficient for the truth of its consequent. - P therefore Q. - If all premises are true then its conclusion must also be true. - True conditional, the truth of the consequent is necessary for the truth of the antecedent. If P, then Q. ~ = not. ~Q then ~P. - Affirming the antecedent and denying the consequent are both valid. If P, then Q. Q, therefore, P. Invalid. It is possible for an argument of this form to have all true premises and a false conclusion. Ex: Dr Mc is taller than 10m, then she is taller than 1m. Conjunction Sentence: P and
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