A Simple Way to Count Parental Lineage
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By using a simple arithmetic formula, you can count the Number of
Relations (NPR), for a given generation, going back any number of
The formula is:
NPR = 2X
where NPR is the number of parental relations and X
= the number of generations back from yours.
For example, going back one generation, X = 1 and we
NPR = 2X = 21 = 2
number of parents.
Going back 2 generations, X = 2 and we have:
NPR = 2X = 22 = 2 x 2 = 4
number of grandparents.
Going back 5 generations, X = 5 and:
NPR = 2X = 25 = 2 x 2 x 2 x 2
x 2 = 32
persons-the number of great great great grand parents.
NOTE: The number of "great"s is always the number of generations,
X, minus two (your parents' generation and your
generation). In the last example it's X - 2 = 5 - 2 = 3
for "great great great grandparents".
Note also that if you go back 0 generations:
NPR = 2X = 20 = 1 person:
The table below summarizes the results going back seven
|Number of Parental
|Number of Grand
|Number of Great Grand Parents|
|Number of Great Great Grand
|Number of Great Great Great Grandparents|
|Number of Great Great Great Great
|Number of Great Great Great Great Great