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3. (15 pts) Let P be the proposition Today is Friday; let Q be the proposition We have an exam today; and let R be

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3. (15 pts) Let P be the proposition "Today is Friday"; let Q be the proposition We have an exam today"; and let R be the proposition "The moon is blue. Write in words the meaning of the following propositions: (a) P~(Q^(R)) (b) (P^Q) -(P) Express the following statements using symbols from propositional logic: (c) If the moon is blue then today is not Friday and we do not have an exam

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