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  4. In a leap year the probability of having 53 Sundays or 53 Mondays is

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Q. In a leap year the probability of having 53 Sundays or 53 Mondays is

Probability

Solution:

Since a leap year has 366 days and hence 52 weeks and 2 days. The 2 days can be SM, MT, TW, WTh, ThF, FSt, St.S.
Therefore, P(53 Sundays or 53 Mondays) $ = \frac{3}{7}$