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Assuming no marriages between relatives (a very poor assumption) and assuming 25 years per generation, 70,000 years means 2800 generations.

The number of ancestors in the 2800th generation would be 2 raised to the 2800th power (22800), and in the 2799th generation, 2 raised to the 2799th power (22799).

So the total number of ancestors is the sum of all those terms.

Just the largest term, 22800, is impossibly large, involving many hundreds of zeros.

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Q: How many total ancestors does the average person have if you go back 70000 years?
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