Solution:
In the 22nd century there are 25 leap years viz.
2100, 2104,…,2196 and 75 non- leap years.
Consider the following events :
= Selecting a leap year from 22nd century
= Selecting a non-leap year from 22nd century
A = There are 53 Sundays in a year of 22nd century
We have,
and
Required probability