Question:
The probability that a non-leap your selected at random will contains 53 Sunday is
(a) $\frac{1}{7}$
(b) $\frac{2}{7}$
(c) $\frac{3}{7}$
(d) $\frac{5}{7}$
Solution:
(a) A non-leap year has 365 days and therefore 52 weeks and 1 day. This 1 day may be Sunday or Monday or Tuesday or Wednesday or Thursday or
Friday or Saturday. Thus, out of 7 possibilities, 1 favourable event is the event that the one day is Sunday.