How Often Does Friday the 13th Occur?

Answer

Friday the 13th has a bad reputation for being unlucky and many people associate this day with a hockey masked killer. This superstition is said to date back to the 1700?s. Friday the 13th occurs at least once every year and often up to 3 times in 1 year. In 2011 Friday the 13th occurred only once but in 2012 it occurred 3 times. Between the years 2005 and 2015 Friday the 13th will occur 20 times.
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Q&A Related to "How Often Does Friday the 13th Occur?"
See proof at. http://wiki.answers.com/Q/Does_every_year_contain_at_least_one_Friday_the_13th. Addendum: If you count the occurrences of each number in mod 7, you will know how many
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