- Friday 13 happens on every month that begins with a Sunday?
- Every year has at least one and at most three Friday the 13ths in it, but usually there are two
- There can be two consecutive months with Friday the 13ths. Do you know which months they will always be?
- Since a calendar repeats itself exactly once every 400 years, statisticians figured out that over those 4800 months (400 years x 12 months) the probability of it being Friday the 13th is .14333 or 688/4800 because 688 months had a Friday the 13th
- If fact, when those people did all that crazy matter to figure out how ofter Friday the 13th happens, it turns out that Friday is the most common day of the week to fall on the 13th. (Since I know you are dying to know the least common day, here it is: Thursdays and Saturdays which happen 684/4800)
The people who figured this out must have had amazing math tutors or algebra help to figure this out. Too bad Mathnasium wasn't around back then!
- Information shared above was retreived from http://www.jimloy.com/math/friday13.htm on Sunday, December 15, 2013.
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