Which day of the week (Sunday, Monday, etc.) is the probability largest to fall on the 13th of a random month, in a random year?

Or is this probability the same for each day of the week?

Considering the 400 year period, from 2001 to 2400, having regard to the Leap Years, a rigorous calculation yields the following probabilities, P(d) corresponding to a given day of the week(d)

d...................P(d)

Monday..........14.2708 %

Tuesday..........14.2708 %

Wednesday.....14.3125 %

Thursday........14.25 %

Friday............14.3333 %

Saturday........14.25 %

Sunday..........14.3125 %

From the above table, it is observed that the probability of 13th being Friday is marginally higher compared to the other six d.o.w.'s.

*Edited on ***August 3, 2007, 12:06 pm**