Using modular arithmetic, prove that every year (including leapyears) has at least one Friday the thirteenth. What is the maximumnumber of Friday the thirteenths in a year?

Using modular arithmetic, prove that every year (including leapyears) has at least one Friday the thirteenth. What is the maximumnumber of Friday the thirteenths in a year?

asked Jun 6, 2021 189k views

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