What is the probability that a leap year has 53 Sundays?
Q1. What is the probability that a leap year has 53 Sundays?
Answer: 2 / 7
Explanation: A leap year has 52 weeks + 2 days. For 53 Sundays, one of the 2 extra days must be Sunday. The 2 extra days can be (Sunday, Monday), (Monday, Tuesday), ..., (Saturday, Sunday). So, 2 out of 7 possibilities have Sunday, hence probability = 2 / 7.