MathDB

In the Gregorian calendar:
(i) years not divisible by

4

are common years; (ii) years divisible by

4

but not by

100

are leap years; (iii) years divisible by

100

but not by

400

are common years; (iv) years divisible by

400

are leap years; (v) a leap year contains

366

days; a common year

365

days.
Prove that the probability that Christmas falls on a Wednesday is not

1/7.

Problem Statement