the month of February has either 28 or 29 days

April, June, September, and November have 30 days

January, March, May, July, August, October, and December have 31 days

let event A be a month that has 30 days

let event B be a month that has 31 day

let even C be a month that starts with a vowel

7. What is P(B U C)^c?

8. what is the probability that a randomly chosen month has 31 days given that it starts with a vowel?