Why Friday the 13th is a mathematical inevitability

No bad luck here—just lots of fascinating math that explains why the 13th of a month so often falls on a Friday

SINSIN
Mar 13, 2026 - 18:00
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Why Friday the 13th is a mathematical inevitability

No bad luck here—just lots of fascinating math that explains why the 13th of a month so often falls on a Friday

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