A leap year has 366 days which comprise of 52 complete weeks and 2 days.
That is each day Monday, Tuesday, Wednesday.....Sunday will occur 52 times.
Now for the additional days of the leap year to be Thursday.
There are two possibilities:(Wednesday, Thursday), (Thursday, Friday)
Thus out of seven there are two favourable outcomes.
Hence probability of having 53 thursday would be 2/7.
Topper Learning Team