No. of days in a leap =366
(3667=52.28)
So, there will be 52 weeks and 2 days
So, every leap year has 52 Sundays
Now, the probability depends on remaining 2 days
The possible pairing of days are
Sunday-Monday
Monday-Tuesday
Tuesday-Wednesday
Wednesday-Thursday
Thursday-Friday
Friday-Saturday
Saturday-Sunday
There are total 7 pairs and out of 7 pairs, only 2 pairs have Sunday. The remaining 5 pairs does not include Sunday
Thus, the probability of not getting Sunday in the last 2 days is 57
Therefore, the probability of only 52 Sundays in a Leap year is 57.