Some people think it is unlucky if the 13th day of a month falls on a Friday. Show that in every calendar year (non leap or leap) there will always be at least one such unlucky Friday but that there can be no more than three
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Home » Mathematics » Some people think it is unlucky if the 13th day of a month falls on a Friday. Show that in every calendar year (non leap or leap) there will always be at least one such unlucky Friday but that there can be no more than three