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There are 52 weeks in a year then find the probability that a leap year has 53 sundays.

Number of days in a leap year = 366

= 52 weeks and 2 days

52 weeks have 52 Sundays. 2 Days are remaining. These 2 days can be arranged as follows:

1: Sunday Monday

2: Monday Tuesday

3: Tuesday Wednesday

4: Wednesday Thursday

5: Thursday Friday

6: Friday Saturday

7: Saturday Sunday

So, there 7 possible ways to arrange these 2 days.

As there are 5 such cases, where neither of the days are Sunday, so number of favorable events(not Sunday) = 5.

(We already have 52 Sundays)

? Required probability