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04/12/2021 5:28 pm
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On which of the following facts does the method of periodic abstinence is based?
(a) Ovulation occurs on about the 14th day of menstruation.
(b) Ovum remains alive for about 1-2 days.
(c) Sperms survive for about 3 days.
(d) All of these
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04/12/2021 5:29 pm
Correct answer: (d) All of these