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Which one of the following is not a part of immediate deductive inference?

Which one of the following is not a part of immediate deductive inference? Correct Answer Syllogism

There are two types of deductive inference namely immediate inference and mediate inference.

  1. Immediate Inference: It involves an argument consisting of two propositions: one premise and a conclusion. Three other immediate inferences are:
    1. Conversion: It is the inference in which the subject and predicate are interchanged.  For example, the converse of "Some men are believers" is "Some believers are men."
    2. Obversion: To form the obverse of a proposition, change the quality of the proposition and replace the predicate by its complement. For example, the obverse of "All believers are saved" is "No believers are non-saved." 
    3. Contraposition: The contrapositive of a proposition is one in which the complement terms of the subject and predicate are interchanged. Contraposition can be thought as first obverting the original, converting the resulting proposition, then obverting the resultant one. For example, the proposition "All humans are mortal" obverts to "No humans are immortal (non-mortal)" which converts to "No non-mortal persons are human" which when obverted yields "All non-mortals are non-human."
  2. Mediate Inference: It has an argument consisting of three propositions: two premises and a conclusion with three terms.

Hence, Syllogism is not a part of immediate deductive inference.

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