How many great, great, great grandparents are required

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Unrelated individuals do NOT share ancestors. All of us are related, because we share ancestors. For 2 people to be unrelated there must be 4 parents, 8 grandparents, 16 great grandparents. How many great, great, great grandparents are required for 2 people drawn at random to be unrelated?

Reference no: EM13112127

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