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Once every 6 or 11 years, in a regular cycle through the year 2100, when the cycle will change. Only one pairing, a non-leap year where February 13 is on a Friday, will have the 13th of the next month (March 13) also on a Friday.
The recent years where this occurs demonstrates the cycle:
1953
1959 (6 years)
1970 (11 years)
1981 (11 years)
1987 (6 years)
1998 (11 years)
2009 (11 years)
2015 (6 years)
2026 (11 years)
2037 (11 years)
2043 (6 years)
Wiki User
∙ 10y ago
Johnny Santi
Odds of any given month having an occurrence = 1/7
Odds of it occurring in a non leap year February = 3/48 = 1/16
1/16 * 1/7 = 1/112 = once every nine years and four months in
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There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.There were two Friday the 13ths in 1996, in September and December.
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