A year which is not a leap year is Normal year having 365 days.
There are 52 weeks, i.e., 52 × 7 = 364 days and 1 day extra in a normal year.
So, the sample space for 1 extra day is expressed as follows:
U = {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
∴ Total primary outcomes n = 7
A = Event that having 53 Fridays in a year which is not a leap year.= {Friday}
∴ Favourable outcome for the event A is m = 1
Hence, P(A) = \(\frac{m}{n} = \frac{1}{7}\)
