If a family tree displaying the current generation (you) and 3 prior generations with a total of 12 grandparents. If you were to trace your family history back 10 generations, how many grandparents would you find?

Answer 1

as with the previous problem, track a few levels and see the geometric pattern.

Of course, over that span, in a normal population, there would be some crossovers occur, resulting in fewer actual individuals.