Triskaidekaphobia
In the course of each 400-year cycle of the Gregorian calendar, there are a total of 146,097 days: 146,000 normal days (365 x 400), plus 97 leap days. Over that 400-year cycle, the 13th day of the month will occur 684 times on Thursday and Saturday, 685 times on Monday and Tuesday, 687 times on Wednesday and Sunday . . . and 688 times on a Friday.
Thus, it is more likely for the 13th to be a Friday than any other day.
Thus, it is more likely for the 13th to be a Friday than any other day.
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