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I have $2$ parents, $4$ grandparents, $8$ great grandparents, etc.

So, going back $N$ generations, I have $2^N$ great...great grandparents.

But $2^N$ is seriously divergent. I only have to go back a small number of generations to exceed the total population of the earth!!

That's impossible, so we have a paradox. What went wrong with the calculation?

Pythagorus
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1 Answers1

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Some of those great...great grandparents are the same people

J. W. Tanner
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