Rita has a 30 -day menstrual cycle. She expects to ovulate on 
April. She wants to avoid pregnancy using the rhythm method of contraception. Based on her ovulation date, which dates would be considered the safe period for intercourse?
Text Solution
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Ovulation date 
April.
Fertile window 
days before ovulation (sperm can survive that long) +1 day after ovulation (egg survives 
hours).
So, unsafe period 
April 
April as there are chances that female may get pregnant during this period.
Safe period (Rhythm method):
Before sperm survival window → till 
April (not in options).
After ovum lifespan ends → from 
April onwards.
In the given options:
21-23 April: unsafe period (just before ovulation).
24-27 April: unsafe period (includes ovulation & egg life).
21-28 April: unsafe window included.
28-30 April: falls after the fertile window, hence safe period.
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