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Unlike common perception, Sherlock Holmes does not employ deductive reasoning.
Many people believe Sherlock Holmes utilizes deductive thinking to solve the perplexing cases he encounters on a daily basis, but in truth, he employs abductive reasoning. Deductive reasoning, on the other hand, begins with a broad theory or hypothesis and evaluates several options to prove the predetermined theory. This, however, is not what Sherlock Holmes does when he arrives at a murder scene. He has no preconceived notions about what happened. Instead, he extrapolates information from what he sees to reach inferences about what actually occurred—this is abductive reasoning.