Evidentiary presumptions distinguish discretionary, mandatory, and conclusive effects in proving facts under the Indian Evidence Act.

Section 4 establishes three evidentiary effects: may presume permits the Court either to treat a fact as proved unless disproved or to require proof; shall presume requires the Court to treat a fact as proved unless disproved; and conclusive proof requires proof of one fact to establish another while excluding evidence to disprove it.

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