Question

The diagram shows that you have 16 great-great-grandparents in the fifth generation back. How many great-great-great-great-great-great-great-grandparents do you have? (That's all your grandparents in the 10th generation back, starting with you as the first.)

Answer 1

Me: 1 (2^0)
Parents: 2 (2^1)
Grandparents: 4 (2^2)
Great-Grandparents: 8 (2^3)
Great-Great-Grandparents: 16 (2^4)
Great-Great-Great-Grandparents: 32 (2^5)
Great-Great-Great-Great-Grandparents: 64 (2^6)
Great-Great-Great-Great-Great-Grandparents: 128 (2^7)
Great-Great-Great-Great-Great-Great-Grandparents: 256 (2^8)
Great-Great-Great-Great-Great-Great-Great-Grandparents: 512 (2^9)

I have 512 great-great-great-great-great-great-great-grandparents in the tenth generation.