Affirming the Consequent

Reviewed by Mattias Durán Santis, co-founder of DebateTournament.org. Last updated 7 October 2026.

Affirming the consequent reasons: if P then Q, Q is true, so P must be true. It fails because Q could have other causes. Debaters answer by giving another way Q could be true, so the conclusion does not follow.

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