Calendar page with phrase Friday The 13th, closeup.
2026-03-13 1275词 困难
But the 13th day of a month that happens to fall on a Friday is just a day. Superstitions about it can be dispelled with mathematics. Using number theory, you can easily demonstrate that there isn’t a single year without this ominous date. In fact, the 13th day of a month falls on a Friday more often than on any other day of the week.
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