In a leap year, the total number of days = 366 days.

In 366 days, there are 52 weeks and 2 days.

Now two days may be

(i) Sunday and Monday

(ii) Monday and Tuesday

(iii) Tuesday and Wednesday

(iv) Wednesday and Thursday

(v) Thursday and Friday

(vi) Friday and Saturday

(vii) Saturday and Sunday

Now there are total 7 possibilities, So total outcomes = 7

In 7 possibilities, Sunday came two times.

So, favorable case = 2

Hence, the probabilities of getting 53 Sundays in a leap year = 2/7