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[Josifus]

Will you miss it next time?



This August has:
5 Sundays
5 Mondays
5 Tuesdays
All in one month - it happens once every 823 years,
and only happens (A) in a month with 31 days, and
(B) when the first day of the month falls on a Sunday.



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Fact or Fiction?
It definitely happens more often than every 823 years. The last month
that had 5 Sundays, Mondays, and Tuesdays was March 2009. The next
one is May 2011. The last time it happened in August was in 2004 and will
happen in August again in 2021. And since there are 7 months that have
31 days, and 7 possible starting days for the month, you can actually
expect that a month beginning on a Sunday and containing 31 days
would happen, on average, once per year. And it will happen on average
every 7 years in August, depending on how the days fall on a leap year.
(setting the record straight - thanks to Heath Countryman)




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