🪙 10 heads in a row vs 👯 Having identical twins
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You're 4.10× more likely to have identical twins
than to flip heads 10 times in a row
Periods differ: Having identical twins is framed as per birth (natural, approx.), while 10 heads in a row is per sequence of 10 fair flips. The multiplier is a raw ratio of the 1-in-X figures — not a normalized lifetime risk. Compare cautiously.
10 heads in a row
1 in 1,024
per sequence of 10 fair flips
Having identical twins
1 in 250
per birth (natural, approx.)
How we calculated this
Each figure is “1 in X.” The larger X is the rarer event. Dividing that number by the more common one gives the multiplier: you're 4.10× more likely to have identical twins. When the periods differ, this is a raw ratio of those figures, not a lifetime-normalized risk.
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You're 4.10× more likely to have identical twins (1 in 250, per birth (natural, approx.)) than to flip heads 10 times in a row (1 in 1,024, per sequence of 10 fair flips). ⚠️ Periods differ (per birth (natural, approx.) vs per sequence of 10 fair flips) — compare cautiously. — How Likely Is That? https://www.howlikelyisthat.com/compare/odds-of-10-coin-flips-in-a-row-vs-odds-of-having-identical-twins
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