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 13^th 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!