Total days in February of a leap year = 29
In a week there are 7 days. So in February of a leap year there are 4 weeks = 28 days and 1 day is extra.
In a week every day comes only once. Hence in 4 weeks every day comes 4 times.
∴ 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 5 Mondays in the month of February in a leap year.
= {Monday}
∴ Favourable outcome for event A is m = 1
Hence, P(A) = \(\frac{m}{n} = \frac{1}{7}\)
