Harder Mathematical Problems
Friday the Thirteenth ★★★★
Friday the thirteenth: a well-known phenomenon. For one, a day to stay in bed, for another just superstition.
The question: For which day of the week (Sunday, Monday, etc.) there is the largest probability that the 13th of an arbitrary month in an arbitrary year falls on that day? Or is this probability for each day of the week the same?
A hint : The rule for leap years is: each year divisible by 4 is a leap year, except for the centenaries that are not divisible by 400.
The answer: Click here!