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2010
Answer:
Because
December
2010 had :
5 Wednesdays
5 Thursdays
5 Fridays
all in one month.
It happens only once every 1005 years.
Rob says
In
your answer, you say that 5 Wed, 5 Thur & 5 Fri happens only
once
every 1055 years.
Is that just for December?
Looking at the calendar for this year May also has this occurrence
Google
says
Any month that has 31 days and
begins on a
Friday will have 5 Fridays, 5 Saturdays, and 5 Sundays.
Similarly,
any
31-day month that begins on a Tuesday, will have 5 Tuesdays, 5
Wednesdays, and 5 Thursdays.
PS:
https://www.timeanddate.com/calendar/823-years.html
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