Question

what is probability having 53 Sundays​

Answer 1

Any year can be of two type iee. Leap year or Normal year

Leap year 366 days therefore no od odd days = 2

Normal year 366 days therefore no od odd days = 1

Probability of a year to be Leap is 1/4

Probability of a year to be non Leap is 1 - 1/4 =3/4

The rest is explain in the picture.