Creationism: If Noah’s flood took place 4,500 years ago and there were just 8 people on board, estimate how many children would each person have to have to reach the current population of 6,446,131,400 (July 2005 est.) people?
Creationism: If Noah's flood took place 4,500 years ago and there were just 8 people on board?
June 4th, 2010 
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2.2 (per couple)
or 1.1 per person
4,500 years, 20 years per generation, that is 225 generations
if the population increases by 9.55% per generation (i.e. 2.191 children), that is more than 6.5 billion.
Wonder of compounding.
So it could easily be done.
If we include that the black death killed 50% of the people in 1351, then it goes all the way up to 9.88%, or 2.198 children per couple)
[I corrected my earlier estimation slightly]
If we assume original two homo sapiens started on the African Savanna about 200,000 years ago, it drops down to 0.22% increase per generation, or 2.0044 children per couple