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On what kind of rules is natural deduction, a proof system, based?

ARandom and chance rules
BSimple and self-evident rules
CStatistical and sampling rules
DRules of ancient custom
Answer & Solution
Correct answer: B. Simple and self-evident rules
1. Natural deduction is a proof system. 2. It is based on simple and self-evident rules of inference. 3. It does not rely on sampling or chance. _Source: Wikipedia, Deductive reasoning, lead section_
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