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Which of the following statements about the Principle of Indirect Proof (RAA) is...

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Which of the following statements about the Principle of Indirect Proof (RAA) is the most appropriate?

RAA is not valid in classical logic.

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RAA states that to prove P, it is sufficient to show that ¬P leads to a contradiction.

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RAA is used to prove ¬P by assuming P.

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RAA is the same as Double Negation Elimination.

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