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OpenStudy (anonymous):
Many people believe Friday the 13th will be an unlucky day. Is it possible that there is no Friday the 13th through the whole year. How many Friday's at the 13th can we have in a year at most? Can you calculate you out?
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OpenStudy (anonymous):
here is another one @AidenS
ganeshie8 (ganeshie8):
requires number theory
OpenStudy (anonymous):
since the week is 7 days and the months is not a multiple of 7 then you have 12 days a year a 13 so 13/7=1.85
OpenStudy (anonymous):
at less one Friday 13 a year and the most is 2
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