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Genealogical answer:

>2 is the number of parents.

>n is the number of generations back.

>x is the number of ancestors within that generation.

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More answers

It means that the variable x is twice as much as variable n.

x is in direct proportion to n (or x varies directly as n) with the constant of proportionality = 2.

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13y ago
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Q: What does x equals 2n mean?
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