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723.1 The test of a prudent person, who acts under
the supposition that a fact exists.
723.2 In the context and circumstances of a
particular case.
724. Analysing this, Y.V. Chandrachud, J. (as the
learned Chief Justice then was) in N.G. Dastane v. S.
Dastane [N.G. Dastane v. S. Dastane, (1975) 2 SCC
326.] held : (SCC pp. 335-36, para 24)
“The belief regarding the existence of a fact
may, thus, be founded on a balance of
probabilities. A prudent man faced with
conflicting probabilities concerning a fact
situation will act on the supposition that the
fact exists, if on weighing the various
probabilities he finds that the preponderance
is in favour of the existence of the particular
fact. As a prudent man, so the court applies
this test for finding whether a fact in issue can
be said to be proved. The first step in this
process is to fix the probabilities, the second to
weigh them, though the two may often
intermingle. The impossible is weeded out at
the first stage, the improbable at the
second. Within the wide range of probabilities
the court has often a difficult choice to make
but it is this choice which ultimately
determines where the preponderance of
probabilities lies. Important issues like those
which affect the status of parties demand a
closer scrutiny than those like the loan on a
promissory note: “the nature and gravity of an
issue necessarily determines the manner of
attaining reasonable satisfaction of the truth of
the issue [ Per Dixon, J, in Wright v. Wright,
(1948) 77 CLR 191 (Aust).] , CLR at p. 210”; or
as said by Lord Denning, “the degree of
probability depends on the subject-matter”. In
proportion as the offence is grave, so ought the
proof to be clear [Blyth v. Blyth, [1966] A.C.
643 : [1966] 2 WLR 634 : (1966) 1 All ER 524
(HL).] , All ER at p. 536’. But whether the issue
is one of cruelty or of a loan on a pronote, the
test to apply is whether on a preponderance of
probabilities the relevant fact is proved. In civil
cases this, normally, is the standard of proof
to apply for finding whether the burden of
proof is discharged.”
(emphasis supplied)