Let A be the event of containing 52 Sundays in leap year and S be the sample space. A leap year contains 366 days i.e. 52 weeks and 2 days extra. The extra two days may be (sun, mon) or (mon, tue), or (tue, wed) or (wed, thurs) or (thurs, fri) or (fri, sat) or (sat, sun) n(S) = 7, n(A) = 2 P(A) =