Question 1102166
There are 7 months with 31 days
jan mar may jul aug oct dec 

There are three starting dates when there are 5 Sundays
If the 1st is a Sunday 1,8,15,22,29
If the 2nd is a Sunday 2,9,16,23,30
If the 3rd is a Sunday 3,10,17,24,31

If you choose a typical 31 day month, what is the probability that you will be needed on a fifth Sunday?
So we have already chosen the 7 eligible months.
In the eligible months, the probability is 3 out of 7 starting days will result in a fifth Sunday.
Write your probability in a simplified fraction.
3/7