The Prophet Muhammad lived around 1400 years ago. Every generation means twice as many people. Let's assume that a generation is 30 years (it would have been much less 1400 years ago) that means about 47 generations. So we need to work out 2 to the power of 470 to see how many people anyone could have been related to back then.
2^470 = 140,737,488,355,328
The population of the world was not as high as 140 trillion back then. That means that most people will be descended from anyone at the time and everyone will be in-bred to some extent.
OK, but ...
The Prophet Muhammad lived around 1400 years ago. Every generation means twice as many people. Let's assume that a generation is 30 years (it would have been much less 1400 years ago) that means about 47 generations. So we need to work out 2 to the power of 470 to see how many people anyone could have been related to back then.
2^470 = 140,737,488,355,328
The population of the world was not as high as 140 trillion back then. That means that most people will be descended from anyone at the time and everyone will be in-bred to some extent.
Thank you. You beat me to it.