How far back is the ancestor who gave me a particular ethnicity?

Table 1. The number of generations back you’d expect to find a given ancestor based on the percentage of a given ethnicity given to you in an ancestry report, all after making the likely poor assumption that all of this ethnicity came from only one ancestor.
Table 2. The expected percentage of ethnicity you’d get from one ancestor who had 100% of that ethnicity and is a whole integer number of generations back from you. The first five rows include enough decimal points to show the exact average for the respective generation.

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