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Reading the draws and working out what chance predicts.
No full dossier yet for 12. The Smorfia line below is its place in the Neapolitan book of dreams; more dossiers are written over time.
Smorfia napoletana'E surdatethe soldiers
Cultural interest — does not change your odds.
What the machines actually did with 12, across every lottery this site holds a long record for.
Across 5 lotteries that hold a 12, its average deviation from expectation is −0.07σ. Statistically ordinary, everywhere.
The one thing a belief about a number can measurably do is change how many people play it — and a jackpot shared more ways is worth less to each winner. That is the only real consequence, and it is arithmetic rather than folklore.