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There are three types of reasonings
Deductive reasoning determines whether the truth of a conclusion can be determined for that rule, based solely on the truth of the premises. Example: “When it rains, things outside get wet. The grass is outside, therefore: when it rains, the grass gets wet.” Mathematical logic and philosophical logic are commonly associated with this type of reasoning.
Inductive reasoning attempts to support a determination of the rule. It hypothesizes a rule after numerous examples are taken to be a conclusion that follows from a precondition in terms of such a rule. Example: “The grass got wet numerous times when it rained, therefore: the grass always gets wet when it rains.” While they may be persuasive, these arguments are not deductively valid, see the problem of induction. Science is associated with this type of reasoning.
Abductive reasoning, a.k.a. inference to the best explanation, selects a cogent set of preconditions. Given a true conclusion and a rule, it attempts to select some possible premises that, if true also, can support the conclusion, though not uniquely. Example: “When it rains, the grass gets wet. The grass is wet. Therefore, it might have rained.” This kind of reasoning can be used to develop a hypothesis, which in turn can be tested by additional reasoning or data. Diagnosticians, detectives, and scientists often use this type of reasoning.
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