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Daniel J Smith Custom TMUA alpha · Q7

Logic & proof

Let PP and QQ be statements. Suppose exactly one of if PP then QQ and if QQ then PP is true, and also PP or QQ is true. Which statement must be true?

APP and QQ is true
BExactly one of PP and QQ is true
CBoth PP and QQ are false
Dif ¬P\neg P then ¬Q\neg Q is true
EPP if and only if QQ is true

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